Question

[Mai Bá Phương]

a) -36:x=30/7

b)2/3.x-4/8=1/8

c)2/7-8/9x=2/3 

d)4/7+5/9:x=1/3

Answer 1

[Huỳnh Quang Sang]

\(a)-36:x=\frac{30}{7}\)

\(\Rightarrow x=-36:\frac{30}{7}\)

\(\Rightarrow x=-36\cdot\frac{7}{30}\)

\(\Rightarrow x=\frac{-36\cdot7}{30}\)

\(\Rightarrow x=-\frac{126}{15}\)

\(b)\frac{2}{3}\cdot x-\frac{4}{8}=\frac{1}{8}\)

\(\Rightarrow\frac{2}{3}\cdot x=\frac{1}{8}+\frac{4}{8}\)

\(\Rightarrow\frac{2}{3}\cdot x=\frac{5}{8}\)

\(\Rightarrow x=\frac{5}{8}:\frac{2}{3}=\frac{15}{16}\)

\(c)\frac{2}{7}-\frac{8}{9}x=\frac{2}{3}\)

\(\Rightarrow\frac{8}{9}x=\frac{2}{7}-\frac{2}{3}\)

\(\Rightarrow\frac{8}{9}x=\frac{6}{21}-\frac{14}{21}\)

\(\Rightarrow\frac{8}{9}x=\frac{-8}{21}\)

\(\Rightarrow x=\frac{-8}{21}:\frac{8}{9}=\frac{-72}{168}=\frac{-3}{7}\)

d, Tự làm