tính nhanh : a) $6\dfrac{5}{7}-\left(1\dfrac{3}{4} 2\dfrac{5}{7}\right)$ b) $7\dfrac{5}{11}-\left(2\dfrac{3}{7} 3\dfrac{5}{11}\right)$ c) \(\dfrac{1}{3}.\dfrac{4}{5} \dfrac{1}{3}.\dfrac{6}{5}-...

5

PN

Phạm Ngân Hà

18 tháng 7 2017

a) $6\dfrac{5}{7}-\left(1\dfrac{3}{4}+2\dfrac{5}{7}\right)$

$=6\dfrac{5}{7}-1\dfrac{3}{4}-2\dfrac{5}{7}$

$=\left(6\dfrac{5}{7}-2\dfrac{5}{7}\right)-1\dfrac{3}{4}$

$=4-1\dfrac{3}{4}$

$=3\dfrac{3}{4}$

PN

Phạm Ngân Hà

18 tháng 7 2017

b) $7\dfrac{5}{11}-\left(2\dfrac{3}{7}+3\dfrac{5}{11}\right)$

$=7\dfrac{5}{11}-2\dfrac{3}{7}-3\dfrac{5}{11}$

$=\left(7\dfrac{5}{11}-3\dfrac{5}{11}\right)-2\dfrac{3}{7}$

$=4-2\dfrac{3}{7}$

$=2\dfrac{3}{7}$

Thực hiện phép tính: a) $11\dfrac{3}{4}-\left(6\dfrac{5}{6}-4\dfrac{1}{2}\right)+1\dfrac{2}{3}$ b) $2\dfrac{17}{20}-1\dfrac{11}{15}+6\dfrac{9}{20}:3$ ...

TT

Trần Thị Thảo

21 tháng 4 2022

1

NL

Nguyễn Lê Phước Thịnh

27 tháng 6 2023

a: =11+3/4-6-5/6+4+1/2+1+2/3

=10+9/12-10/12+6/12+8/12

=10+13/12=133/12

b: $=2+\dfrac{17}{20}-1-\dfrac{11}{15}+2+\dfrac{3}{20}$

=3-11/15

=34/15

c: $=\dfrac{31}{7}:\left(\dfrac{7}{5}\cdot\dfrac{31}{7}\right)$

$=\dfrac{31}{7}:\dfrac{31}{5}=\dfrac{5}{7}$

d: $=\dfrac{29}{8}\cdot\dfrac{36}{29}\cdot\dfrac{15}{23}\cdot\dfrac{23}{5}=\dfrac{9}{2}\cdot3=\dfrac{27}{2}$

CH

Chử Hải Yến

29 tháng 5 2022

Tính hợp lý:

$A=\dfrac{7}{12}+\dfrac{5}{12}:6-\dfrac{11}{36}$ $B=\left(\dfrac{4}{5}+\dfrac{1}{2}\right):\left(\dfrac{3}{13}-\dfrac{8}{13}\right)$

$C=\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right):\left(\dfrac{5}{12}+1-\dfrac{7}{11}\right)$

$a,\dfrac{-6}{11}:\left(\dfrac{3}{5}:\dfrac{4}{11}\right)$ b,$\dfrac{7}{12}+\dfrac{5}{12}:6-\dfrac{11}{36}$$c,\left(\dfrac{4}{5}+\dfrac{1}{2}\right):\left(\dfrac{3}{13}-\dfrac{8}{13}\right)$ $d,\left(\dfrac{2}{3}-\dfrac{1}{4}+\dfrac{5}{11}\right):\left(\dfrac{5}{12}-1-\dfrac{7}{11}\right)$ Giúp mik...

1

NL

Nguyễn Lê Phước Thịnh

29 tháng 5 2022

a: $A=\dfrac{7}{12}+\dfrac{5}{72}-\dfrac{11}{36}=\dfrac{42}{72}+\dfrac{5}{72}-\dfrac{22}{72}=\dfrac{25}{72}$

b: $B=\dfrac{8+5}{10}:\dfrac{-5}{13}=\dfrac{13}{10}\cdot\dfrac{13}{-5}=-\dfrac{169}{100}$

c: $C=\left(\dfrac{88}{132}-\dfrac{33}{132}+\dfrac{60}{132}\right):\left(\dfrac{55}{132}+\dfrac{132}{132}-\dfrac{84}{132}\right)$

$=\dfrac{88-33+60}{55+132-84}=\dfrac{115}{103}$

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QN

quan nguyen hoang

19 tháng 2 2022

Tính giá trí của biểu thức sau theo cách hợp lí nhất. a) $\mathrm{A}=\dfrac{3}{5} \cdot \dfrac{6}{7}+\dfrac{3}{7}: \dfrac{5}{3}-\dfrac{2}{7}: 1 \dfrac{2}{3}$; b) $\mathrm{B}=\left(-13 \cdot \dfrac{2}{5}+\dfrac{-2}{9}: 2 \dfrac{1}{2}+\dfrac{2}{5}. \dfrac{11}{9}\right) \cdot 2 \dfrac{1}{2}$; c) $\mathrm{C}=\left(\dfrac{-4}{5}+\dfrac{5}{7}\right): \dfrac{2}{3}+\left(\dfrac{-1}{5}+\dfrac{2}{7}\right): \dfrac{2}{3}$; d)...

1

NL

Nguyễn Lê Phước Thịnh

19 tháng 2 2022

a: $=\dfrac{-6}{11}:\dfrac{3\cdot11}{4\cdot5}=\dfrac{-6}{11}\cdot\dfrac{20}{33}=\dfrac{-2}{11}\cdot\dfrac{20}{11}=\dfrac{-40}{121}$

b: $=\dfrac{7}{12}+\dfrac{5}{72}-\dfrac{11}{36}=\dfrac{42}{72}+\dfrac{5}{72}-\dfrac{22}{72}=\dfrac{25}{72}$

c: $=\dfrac{13}{10}:\dfrac{-5}{13}=\dfrac{-169}{50}$

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TD

Thầy Đức Anh

Giáo viên VIP

27 tháng 4 2022

14

PT

Phạm Trường Giang

VIP

22 tháng 6 2022

a) $A = \frac{3}{5} . \frac{6}{7} + \frac{3}{7} . \frac{3}{5} - \frac{2}{7} . \frac{3}{5}$
$= \frac{3}{5} \cdot (\frac{6}{7} + \frac{3}{7} - \frac{2}{7}) = \frac{3}{5}$
b) $B = (- 13 \cdot \frac{2}{5} + \frac{- 2}{9} \cdot \frac{2}{5} + \frac{2}{5} \cdot \frac{11}{9}) \cdot \frac{5}{2}$
$= (- 13 - \frac{2}{9} + \frac{11}{9}) \cdot \frac{2}{5} \cdot \frac{5}{2} = - 13 + (\frac{11}{9} - \frac{2}{9}) = - 12 .$
c) $C = (\frac{- 4}{5} + \frac{5}{7}) \cdot \frac{3}{2} + (\frac{- 1}{5} + \frac{2}{7}) \cdot \frac{3}{2} = (\frac{- 4}{5} + \frac{5}{7} + \frac{- 1}{5} + \frac{2}{7}) \cdot \frac{3}{2} = ((\frac{- 4}{5} + \frac{- 1}{5}) + (\frac{5}{7} + \frac{2}{7})) \cdot \frac{3}{2} = 0 .$
d) $D = \frac{4}{9} : (\frac{1}{15} - \frac{10}{15}) + \frac{4}{9} : (\frac{2}{22} - \frac{5}{22})$
$= \frac{4}{9} : \frac{- 3}{5} + \frac{4}{9} : \frac{- 3}{22} = \frac{4}{9} \cdot \frac{- 5}{3} + \frac{4}{9} . \frac{- 22}{3}$
$= \frac{4}{9} \cdot (\frac{- 5}{3} + \frac{- 22}{3}) = \frac{4}{9} . \frac{- 27}{3} = - 4 .$

T

TINH

13 tháng 7 2022

a) $\mathrm{A}=\dfrac{3}{5}. \dfrac{6}{7}+\dfrac{3}{7}. \dfrac{3}{5}-\dfrac{2}{7}. \dfrac{3}{5}$

b) $\mathrm{B} =\left(-13 \cdot \dfrac{2}{5}+\dfrac{-2}{9} \cdot \dfrac{2}{5}+\dfrac{2}{5} \cdot \dfrac{11}{9}\right) \cdot \dfrac{5}{2}$
$=\left(-13-\dfrac{2}{9}+\dfrac{11}{9}\right) \cdot \dfrac{2}{5} \cdot \dfrac{5}{2}=-13+\left(\dfrac{11}{9}-\dfrac{2}{9}\right)=-12 .$
c) $\mathrm{C} =\left(\dfrac{-4}{5}+\dfrac{5}{7}\right) \cdot \dfrac{3}{2}+\left(\dfrac{-1}{5}+\dfrac{2}{7}\right) \cdot \dfrac{3}{2} =\left(\dfrac{-4}{5}+\dfrac{5}{7}+\dfrac{-1}{5}+\dfrac{2}{7}\right) \cdot \dfrac{3}{2}=\left(\left(\dfrac{-4}{5}+\dfrac{-1}{5}\right)+\left(\dfrac{5}{7}+\dfrac{2}{7}\right)\right) \cdot \dfrac{3}{2}=0 .$
d) $\mathrm{D}=\dfrac{4}{9}:\left(\dfrac{1}{15}-\dfrac{10}{15}\right)+\dfrac{4}{9}:\left(\dfrac{2}{22}-\dfrac{5}{22}\right)$

Thực hiện phép tính a. $\dfrac{-1}{24}-\left\{\dfrac{1}{4}-\left(\dfrac{1}{2}-\dfrac{7}{8}\right)\right\}$ b.$\left(8\dfrac{5}{11}+3\dfrac{5}{8}\right)-3\dfrac{5}{11}$ c.$\dfrac{4}{9}:\left(\dfrac{-1}{7}\right)+6\dfrac{5}{9}:\left(\dfrac{-1}{7}\right)$ d. $\left(\dfrac{-1}{5}+\dfrac{3}{7}\right):\dfrac{2}{11}+\left(\dfrac{-4}{5}+\dfrac{4}{7}\right):\dfrac{2}{11}$ M.n giúp mk...

VP

Vũ Phương Anh

25 tháng 7 2018

1

PK

phạm khánh linh

26 tháng 7 2018

a. = $\dfrac{-1}{24}-\left\{\dfrac{1}{4}-\dfrac{-3}{8}\right\}$

= $\dfrac{-1}{24}-\left\{\dfrac{1}{4}+\dfrac{3}{8}\right\}$

= $\dfrac{-1}{24}-\dfrac{5}{8}$

= $\dfrac{-2}{3}$

b. = $12\dfrac{7}{88}-3\dfrac{5}{11}$

= $8\dfrac{5}{8}$

c. = $\dfrac{-28}{9}+\dfrac{-413}{9}$

= $-49$

d. = $\dfrac{8}{35}:\dfrac{2}{11}+\dfrac{-8}{35}:\dfrac{2}{11}$

= $\dfrac{2}{11}:\left(\dfrac{8}{35}+\dfrac{-8}{35}\right)$

= 0

Tính giá trị biểu thức a, $\dfrac{5.8-5.6}{10}$ b, $\dfrac{\left(-4\right)^2}{5}$ B = $\dfrac{3}{7}+\left(\dfrac{-1}{5}+\dfrac{-3}{7}\right)$ C = $\left(6-2\dfrac{4}{5}\right).3\dfrac{1}{8}-1\dfrac{3}{5}:\dfrac{1}{4}$ D = $\left(\dfrac{-5}{24}+0,75+\dfrac{7}{12}\right):\left(-2\dfrac{1}{8}\right)$ E = $\dfrac{-5}{7}.\dfrac{2}{11}+\dfrac{-5}{7}.\dfrac{9}{11}+1\dfrac{5}{7}$ F =...

L

linlingg103

7 tháng 4 2018

1

NL

Nguyễn Lê Phước Thịnh

28 tháng 6 2022

a: $=\dfrac{5\cdot\left(8-6\right)}{10}=\dfrac{5\cdot2}{10}=1$

b: $\dfrac{\left(-4\right)^2}{5}=\dfrac{16}{5}$

$B=\dfrac{3}{7}-\dfrac{1}{5}-\dfrac{3}{7}=-\dfrac{1}{5}$

c: $C=\left(6-2.8\right)\cdot\dfrac{25}{8}-\dfrac{8}{5}\cdot4$

$=\dfrac{16}{5}\cdot\dfrac{25}{8}-\dfrac{32}{5}$

$=5\cdot2-\dfrac{32}{5}=10-\dfrac{32}{5}=\dfrac{18}{5}$

d: $D=\left(\dfrac{-5}{24}+\dfrac{18}{24}+\dfrac{14}{24}\right):\dfrac{-17}{8}$

$=\dfrac{27}{24}\cdot\dfrac{-8}{17}=\dfrac{-9}{8}\cdot\dfrac{8}{17}=\dfrac{-9}{17}$

A

Aduvjp

20 tháng 12 2022

Tính:

a) $\sqrt{\dfrac{9}{16}}-\dfrac{5}{6}+\dfrac{3}{2}$ b) $\left(\dfrac{1}{9}+\dfrac{2}{3}\right)^2-\dfrac{5}{3}:\sqrt{25}$

c)$\dfrac{5}{11}.\left(-\dfrac{3}{7}\right)+\dfrac{5}{11}.\left(\dfrac{-5}{7}\right)+\left(-\dfrac{8}{7}\right).\dfrac{6}{11}$

d) $\dfrac{2^8.2^{18}}{8^5.4^6}$

1

NL

Nguyễn Lê Phước Thịnh

20 tháng 12 2022

a: $=\dfrac{3}{4}-\dfrac{5}{6}+\dfrac{3}{2}=\dfrac{9-10+18}{12}=\dfrac{17}{12}$

b: $=\left(\dfrac{1}{9}+\dfrac{6}{9}\right)^2-\dfrac{1}{3}=\dfrac{49}{81}-\dfrac{27}{81}=\dfrac{22}{81}$

c; $=\dfrac{5}{11}\left(-\dfrac{3}{7}-\dfrac{5}{7}\right)+\dfrac{-8}{7}\cdot\dfrac{6}{11}=\dfrac{-8}{7}\left(\dfrac{5}{11}+\dfrac{6}{11}\right)=-\dfrac{8}{7}$

d: $=\dfrac{2^{26}}{2^{15}\cdot2^{12}}=\dfrac{1}{2}$

Đúng(2)

T

Top1phiphaiVinh_Phuc

21 tháng 9 2023

a)$0,5+\dfrac{1}{3}+0,4+\dfrac{5}{7}-\dfrac{1}{6}-\dfrac{4}{35}$
b)$\left(3-\dfrac{1}{4}+\dfrac{2}{3}\right)-\left(5+\dfrac{1}{3}-\dfrac{6}{5}\right)-\left(-6-\dfrac{7}{4}+\dfrac{3}{2}\right)$
c)$\dfrac{1}{3}-\dfrac{3}{4}-\left(-\dfrac{3}{5}\right)+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}$

1

NM

Nguyễn Minh Dương

VIP

21 tháng 9 2023

$a,0,5+\dfrac{1}{3}+0,4+\dfrac{5}{7}-\dfrac{1}{6}-\dfrac{4}{35}\\ =\dfrac{1}{2}+\dfrac{1}{3}+\dfrac{2}{5}+\dfrac{5}{7}-\dfrac{1}{6}-\dfrac{4}{35}\\ =\dfrac{5}{6}+\dfrac{39}{35}-\dfrac{1}{6}-\dfrac{4}{35}\\ =\left(\dfrac{5}{6}-\dfrac{1}{6}\right)+\left(\dfrac{39}{35}-\dfrac{4}{35}\right)\\ =\dfrac{2}{3}+1\\ =\dfrac{4}{3}.$

$b,\left(3-\dfrac{1}{4}+\dfrac{2}{3}\right)-\left(5+\dfrac{1}{3}-\dfrac{6}{5}\right)-\left(-6-\dfrac{7}{4}+\dfrac{3}{2}\right)\\ =3-\dfrac{1}{4}+\dfrac{2}{3}-5-\dfrac{1}{3}+\dfrac{6}{5}+6+\dfrac{7}{4}-\dfrac{3}{2}\\ =\left(3-5+6\right)+\left(-\dfrac{1}{4}+\dfrac{7}{4}\right)+\left(\dfrac{2}{3}-\dfrac{1}{3}\right)+\left(\dfrac{6}{5}+\dfrac{7}{4}\right)\\ =4-\dfrac{3}{2}+\dfrac{1}{3}+\dfrac{59}{20}\\ =\dfrac{5}{2}+\dfrac{1}{3}+\dfrac{59}{20}\\ =\dfrac{17}{6}+\dfrac{59}{20}\\ =\dfrac{347}{60}.$

$c,\dfrac{1}{3}-\dfrac{3}{4}-\left(-\dfrac{3}{5}\right)+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}\\ =\dfrac{1}{3}+\dfrac{3}{4}+\dfrac{3}{5}+\dfrac{1}{64}-\dfrac{2}{9}-\dfrac{1}{36}+\dfrac{1}{15}\\ =\left(\dfrac{1}{3}-\dfrac{2}{9}\right)+\left(\dfrac{3}{4}-\dfrac{1}{36}\right)+\left(\dfrac{3}{5}+\dfrac{1}{15}\right)+\dfrac{1}{64}\\ =\dfrac{1}{9}+\dfrac{13}{18}+\dfrac{2}{3}+\dfrac{1}{64}\\ =\dfrac{3}{2}+\dfrac{1}{64}\\ =\dfrac{65}{64}.$

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T

Top1phiphaiVinh_Phuc

21 tháng 9 2023

câu cuối có sai ko bn?

Đúng(2)

D

dangthuylinh

27 tháng 7 2017

*Phép chia

a)$11\dfrac{1}{4}-\left(2\dfrac{5}{7}+5\dfrac{1}{4}\right)$

b)$\left(8\dfrac{5}{11}+3\dfrac{5}{8}\right)-3\dfrac{5}{11}$

c)$\dfrac{-1}{4}.13\dfrac{9}{11}-0,25.6\dfrac{2}{11}$

d)$\dfrac{4}{9}:\left(\dfrac{-1}{7}\right)+6\dfrac{5}{9}:\left(\dfrac{-1}{7}\right)$

1

D

dangthuylinh

27 tháng 7 2017

Không cần trả lời nữa đâu ha