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
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