Question

Tìm số x biết:

a/ -5x = 10x + 5 .(-3)²

b/ -1/2 - ( x - 1/3 ) = -1/6

Answer 1

a/10x+5x=45

15x=45

x=45:15

x=3

vậy x=3

Answer 2

a, \(-5x=10x+5.\left(-3\right)^2\)

\(\Rightarrow-5x=10x+5.9\)

\(\Rightarrow-5x=10x+45\)

\(\Rightarrow-5x-10x=45\)

\(\Rightarrow-15x=45\)                    \(\Rightarrow x=-3\)

Answer 3

B/ -1/2-(x-1/3)=-1/6 

(x-1/3)=-1/2-1/6 

x-1/3=-2/3 

x=2/3+1/3

x=3/3=1