a.(1-2x) ³=-8 b.12-8 ×(3/2) ³ c.100 ×căn0.04+căn25/16 Bài 2: a.1/2+2/3 ×x=4/5 b.|x+3/4|-1/2=0 c.(3cănx+5-5):2-20=18

a.(1-2x)³=-8=>1-2x=-2=>-2x=-3=>x=$\frac{2}{3}$

b.12-8 ×(3/2) ³=12-$2^{3}$*$\frac{3}{2}$ =12-$3^{3}$=12-27=-15

c.100×$\sqrt[]{0,04}$ +$\sqrt{}$ $\frac{25}{16}$ =100×0,2+$\frac{5}{4}$=21.25

b2

a,$\frac{1}{2}$ +$\frac{2}{3}$ ×x=$\frac{4}{5}$=>$\frac{2}{3}$ ×x=0,3=>x=0,45

b,|x+$\frac{3}{4}$|-$\frac{1}{2}$=0=>|x+$\frac{3}{4}$|=$\frac{1}{2}$=>x+$\frac{3}{4}$=$\frac{1}{2}$ hoac x+$\frac{3}{4}$=-$\frac{1}{2}$

=>x=-0,25;x=-1.25

c,(3cănx+5-5):2-20=18=>$\sqrt[3]{x}$ /2=38=>$\sqrt[3]{x}$=76=>x=438976