Question

Tìm x:

a) (2x/3 - 3) : (-10) = 2/5

b) (x + 5)^3 = 64

Answer 1

a) \(\left(\frac{2x}{3}-3\right)\div\left(-10\right)=\frac{2}{5}\)

\(\Rightarrow\left(\frac{2x}{3}-\frac{9}{3}\right).-\frac{1}{10}=\frac{2}{5}\)

\(\Rightarrow\frac{2x-9}{3}.-\frac{1}{10}=\frac{2}{5}\)

\(\Rightarrow\frac{9-2x}{30}=\frac{2}{5}\Rightarrow\left(9-2x\right).5=60\)

\(\Rightarrow45-10x=60\Rightarrow-10x=15\Rightarrow x=-\frac{15}{10}=-1,5\)

b)\(\left(x+5\right)^3=64\)

\(\Rightarrow\left(x+5\right)^3=4^3\)

\(\Rightarrow x+5=4\Rightarrow x=-1\)

Answer 2

A, 2x/3-3=-4

2x/3=-1

2x=-3

X=-3/2

B,(x+5)^3=4^3

=> x+5=4

X=-1

k nha

Answer 3

b) x+5 =4

x=-1