Question

Giup em 4 cau nay voi a, tim x

Answer 1

Lời giải:

a.

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

b.

$x+\frac{3}{10}=\frac{17}{12}-\frac{17}{20}=\frac{17}{30}$

$x=\frac{17}{30}-\frac{3}{10}=\frac{4}{15}$

c.

$x=\frac{3}{4}-\frac{7}{8}=\frac{-1}{8}$

d.

$\frac{x}{20}=\frac{7}{12}+\frac{11}{30}=\frac{19}{20}$

$\Rightarrow x=19$