Question

Answer 1

Lời giải:
c.

$(2\frac{1}{3}+3,5).0,2+25\text{%}=\frac{35}{6}.0,2+\frac{1}{4}$

$=\frac{7}{6}+\frac{1}{4}=\frac{17}{12}$

d.

$2,8:(\frac{1}{5}-3x)=1\frac{2}{5}$

$\frac{1}{5}-3x=2,8: 1\frac{2}{5}=2$

$3x=\frac{1}{5}-2=\frac{-9}{5}$

$x=\frac{-9}{5}:3=\frac{-3}{5}$