Tính thuận tiện nhat
a)6450+6540+550-540
b)25×20×4×5×7
c)44+44×16+44×2-44×9
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HT
3
H9
HT.Phong (9A5)
CTVHS
18 tháng 9 2023
\(\dfrac{16\times25+44\times100}{29\times96+124\times48}\)
\(=\dfrac{16\times25+44\times25\times4}{29\times2\times48+124\times48}\)
\(=\dfrac{25\times16+176\times25}{48\times\left(58+124\right)}\)
\(=\dfrac{25\times192}{48\times182}\)
\(=\dfrac{50}{91}\)
PT
2
Y
9 tháng 3 2023
\(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}=\dfrac{14}{32}-\dfrac{4}{32}+\dfrac{9}{32}=\dfrac{19}{32}\)
\(\dfrac{5}{4}-\dfrac{25}{30}\times\dfrac{37}{44}+\dfrac{-25}{30}\times\dfrac{13}{44}+\dfrac{-25}{30}\times\dfrac{-6}{44}\)
\(=-\dfrac{25}{30}\times\left(\dfrac{5}{4}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\left(\dfrac{55}{44}+\dfrac{37}{44}+\dfrac{13}{44}-\dfrac{6}{44}\right)\)
\(=-\dfrac{25}{30}\times\dfrac{99}{44}\)
\(=-\dfrac{5}{6}\times\dfrac{9}{4}\)
\(=-\dfrac{15}{8}\)
H9
HT.Phong (9A5)
CTVHS
9 tháng 3 2023
\(\left(\dfrac{7}{16}+\dfrac{-1}{8}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\left(\dfrac{14}{32}+\dfrac{-4}{32}+\dfrac{9}{32}\right):\dfrac{5}{4}\)
\(=\dfrac{19}{32}:\dfrac{5}{4}\)
\(=\dfrac{19}{32}.\dfrac{4}{5}=\dfrac{19.4}{32.5}=\dfrac{19}{40}\)
\(\dfrac{-25}{30}.\dfrac{37}{44}+\dfrac{-25}{30}.\dfrac{13}{44}+\dfrac{-25}{30}.\dfrac{-6}{44}\)
\(=\dfrac{-25}{30}.\left(\dfrac{37}{44}+\dfrac{13}{44}+\dfrac{-6}{44}\right)\)
\(=\dfrac{-25}{30}.\dfrac{44}{44}=\dfrac{-5}{6}.1=-\dfrac{5}{6}\)
LV
16 tháng 5 2022
B. 173 + 45 + 135 + 27 + 50
= (173+27) + (45 +135) +50
=200 + 180 + 20 + 30
= 200 +200 +30
=430
DN
1
NN
1
24 tháng 5 2022
\(\left(A+9\right)+\left(A-8\right)+\left(A+7\right)+\left(A-6\right)+\left(A+5\right)+\left(A+44\right)=63,3\)
\(\left(2A+53\right)+\left(2A-1\right)+\left(2A-1\right)=63,3\)
\(6A-51=63,3\)
\(6A=114,3\)
\(A=19,05\)
s) 6450 + 6540 + 550 - 540
= ( 6450 + 550 ) + ( 6540 - 540 )
= 7000 + 6000
= 13000
b) 25 x 20 x 4 x 5 x 7
= ( 25 x 4 ) x ( 20 x 5 ) x 7
= 100 x 100 x 7
= 10000 x 7
= 70000
c) 44 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x 1 + 44 x 16 + 44 x 2 - 44 x 9
= 44 x ( 1 + 16 + 2 - 9 )
= 44 x 10
= 440
a)
\(6450+6540+550-540\)
\(=\left(6450+550\right)+\left(6540-540\right)\)
\(=7000+6000\)
\(=13000\)
b)
\(25\times20\times4\times5\times7\)
\(=\left(25\times4\right)\times\left(20\times5\right)\times7\)
\(=100\times100\times7\)
\(=10000\times7\)
\(=70000\)
c)
\(44+44\times16+44\times2-44\times9\)
\(=44\times1+44\times16+44\times2-44\times9\)
\(=44\times\left(1+16+2-9\right)\)
\(=44\times10\)
\(=440\)