Question

tìm x;

a/ \(\frac{-1}{2}\) - \(\frac{3}{4}\) : x =\(\frac{-11}{36}\)

b/ (2x +1)² = 25

c/ (3 - 3x)² +12 =16

d/ (x+2)² =49

Answer 1

Tự ghi đề nhé!

a.   \(\frac{-3}{4}:x=\frac{-11}{36}+\frac{1}{2}\)

                   =  7/36

               x  =   7/36 : -3/4  =   -7/27

Answer 2

b.   \(\orbr{\begin{cases}2x+1=5\\2x+1=-5\end{cases}}\)

Vậy x=2  hoặc x=-3

c.  (3-3x)² = 4

3-3x =  2  hoặc 3-3x = -2

Vậy x= 1/3   hoăc  x = 5/3

d.  x+2 = 7 hoặc x+2 = -7

Vậy x=5 hoặc x=-9

Answer 3

a, -1/2 - 3/4:x=-11/36

=>3/4:x=-1/2 -  -11/36=1/4=>x=3/4:1/4=3

b, (2x+1)^2=25

=>(2x+1)^2=5^2

=>2x+1=5

=>2x=4

=>x=2

c,(3-3x)^2 +12=16=>(3-3x)^2=4=>(3-3x)^2=2^2=>3-3x=2=>3x=1=>x=1/3

d,(x+2)^2=49

=>(x+2)^2=7^2

=>x+2=7

=>x=5