Question

Answer 1

Lời giải:
a.

$\frac{3}{4}x-\frac{1}{2}=\frac{-5}{6}$

$\frac{3}{4}x=\frac{-5}{6}+\frac{1}{2}=\frac{-1}{3}$

$x=\frac{-1}{3}:\frac{3}{4}=\frac{-4}{9}$

b.

$(75\text{%}x-2\frac{1}{2}).\frac{2}{3}=\frac{1}{8}$

$(\frac{3}{4}x-\frac{5}{2}).\frac{2}{3}=\frac{1}{8}$

$\frac{3}{4}x-\frac{5}{2}=\frac{3}{16}$

$\frac{3}{4}x=\frac{3}{16}+\frac{5}{2}=\frac{43}{16}$

$x=\frac{43}{16}: \frac{3}{4}=\frac{43}{12}$