Đáp án:
Giải thích các bước giải:
a)0,25:$\frac{1}{8}$=0,75.4-2x
⇔0,25:0,125=3-2x
⇔2=3-2x
⇔2x=3-2
⇔2x=1
⇔x=$\frac{1}{2}$
b)$\frac{24}{27}$:x+$\frac{28}{21}$ =3
⇔$\frac{8}{9}$:x+$\frac{4}{3}$ =3
⇔$\frac{9}{8}$x=3-$\frac{4}{3}$
⇔$\frac{9}{8}$x=$\frac{5}{3}$
⇔x=$\frac{5}{3}$:$\frac{9}{8}$
⇔x=$\frac{40}{27}$
$\frac{24}{27}$:x+$\frac{28}{21}$ =$\frac{1}{3}$
⇔$\frac{8}{9}$:x+$\frac{4}{3}$ =$\frac{1}{3}$
⇔$\frac{9}{8}$x=$\frac{1}{3}$-$\frac{4}{3}$
⇔$\frac{9}{8}$x=-1
⇔x=$\frac{-8}{9}$
c)[(x-$\frac{1}{2}$):6+4].$\frac{6}{9}$=$\frac{3}{5}$:$\frac{3}{20}$
⇔[(x-$\frac{1}{2}$):6+4].$\frac{6}{9}$=4
⇔(x-$\frac{1}{2}$):6+4=4:$\frac{6}{9}$
⇔(x-$\frac{1}{2}$):6+4=6
⇔x-$\frac{1}{2}$:6=6-4=2
⇔x-$\frac{1}{2}$=2.6=12
⇔x=12+$\frac{1}{2}$
⇔x=$\frac{25}{2}$
Cho mk ctlhn nha
Chúc bạn học tốt ^-^
