Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
cái này dễ quá em ơi chỉ cần nhớ kiến thức cơ bản là làm được em nên tự làm nhé
a) 2/5 + 1/2 + 7/10
= 4/10 + 5/10 + 7/10
= 9/10 + 7/10
= 16/10 = 8/5
b) 4/9 + 11/8 - 5/6
= 32/72 + 99/72 - 60/72
= 191/72
c) 9/20 - 8/15 x 5/12
= 9/20 - 2/9
= 41/180
d) 2/3 : 4/5 : 7/12
= 5/6 : 7/12
= 10/7
\(\frac{2}{3}+\frac{5}{9}-\frac{3}{4}=\frac{24}{36}+\frac{20}{36}-\frac{15}{36}\)\(=\frac{29}{36}\)
\(\frac{2}{5}\times\frac{1}{4}:\frac{3}{8}=\frac{2\times1\times8}{5\times4\times3}=\frac{16}{60}=\frac{4}{15}\)
a) 2/3 + 5/9 = 11/9 - 3/4 = 17/36
b) 2/5 * 1/4 = 1/10 : 3/8 = 4/15
Mik cũng ko chắc nữa có sai thì cho mink sorry bạn nha
5/7 : 2/3 = 5/7 x 3/2 = 15/14
9/11 : 8 /13 = 9/11 x 13/8 = 117/88
1/8 : 1/6 = 1/8 x 6 = 3/4
4/15 : 7/30 = 4/15 x 30/7 = 8/7
\(\frac{5}{7}:\frac{2}{3}=1\frac{1}{14}\) \(\frac{9}{11}:\frac{8}{13}=1\frac{29}{88}\)
\(\frac{1}{8}:\frac{1}{6}=\frac{3}{4}\) \(\frac{4}{15}:\frac{7}{30}=1\frac{1}{7}\)\(k\)\(nha\)\(!!!!!!!!!!!!!!\)
a.\(y:\dfrac{4}{5}=\dfrac{11}{8}\)
\(y=\dfrac{11}{8}\times\dfrac{4}{5}\)
\(y=\dfrac{11}{10}\)
b.\(\dfrac{11}{3}-y=\dfrac{1}{9}\)
\(y=\dfrac{11}{3}-\dfrac{1}{9}\)
\(y=\dfrac{32}{9}\)
c.\(\dfrac{1}{7}\times x=\dfrac{8}{5}\)
\(x=\dfrac{8}{5}:\dfrac{1}{7}\)
\(x=\dfrac{56}{5}\)
A, 5/6 + 13/6 = 3
B, 9/16 - 3/8 = 3/16
C, 2/9 x 5/3 = 10/27
D, 4/6 + 7/3 x 5/2 = 13/2
a,\(\frac{7}{8}+\frac{3}{5}=\frac{35}{40}+\frac{24}{40}=\frac{35+24}{40}=\frac{59}{40}\)
b, \(\frac{20}{24}:\frac{5}{8}=\frac{20}{24}x\frac{8}{5}=\frac{20x8}{24x5}=\frac{160}{120}=\frac{4}{3}\)
c,\(\frac{8}{3}-\frac{2}{5}x\frac{1}{6}=\frac{8}{3}-\frac{2x1}{5x6}=\frac{8}{3}-\frac{1}{15}=\frac{13}{5}\)
a) 7/8 + 3/5 = 59/40
b) 20/24 : 5/8 = 4/3
c) 8/3 - 2/5 x 1/6 = 8/3 - 1/15 = 13/5
a)2/3x4/7=8/21
b)8/21:2/3=8/21x3/2=24/42=4/7
c)8/21:4/7=8/21x7/4=56/85=7//12
d)4/7X2/3=8/21
\(a;\frac{3}{7}+\frac{2}{3}=\frac{9}{21}+\frac{14}{21}=\frac{23}{21}\)
\(b;\frac{8}{7}-\frac{12}{28}\times\frac{7}{3}=\frac{8}{7}-\frac{3}{7}\times\frac{7}{3}=\frac{8}{7}-1=\frac{8}{7}-\frac{7}{7}=\frac{1}{7}\)
\(c;\frac{5}{6}\times3=\frac{15}{6}=\frac{5}{2}\)
\(d;\frac{3}{2}:\frac{7}{15}=\frac{3}{2}\times\frac{15}{7}=\frac{45}{14}\)
a) 3/7+2/3=9/21+14/21=23/21
b) 8/7-12/28*7/3=8/7-1=8/7-7/7-1/7
c) 5/6*3=5/2
d) 3/2:7/15=3/2*15/7=45/14
a) \(\frac{3}{5}+\frac{11}{20}=\frac{12}{20}+\frac{11}{20}\)
\(=\frac{23}{20}\)
b) \(\frac{5}{8}-\frac{4}{9}=\frac{45}{72}-\frac{32}{72}\)
\(=\frac{13}{72}\)
c) \(\frac{9}{16}\times\frac{4}{3}=\frac{9\times4}{16\times3}\)
\(=\frac{36}{48}=\frac{3}{8}\)
a)=23/20
b)=13/72
c)3/4