Question

Tìm so nguyen x biet:

a)-4 . ( 2x +9 ) = ( -8x + 3 ) 

b) 1 + x - 2 . ( 5 + 3x ) = 4 - 5x

c) 3. ( 2 - x ) + 1 = - 3x + 7

       Ai nhanh mình k nha ! Cảm ơn nhiều

 

Answer 1

\(a,-4\left(2x+9\right)=\left(-8x+3\right)\)

\(\Rightarrow-8x-36=-8x+3\)

\(\Rightarrow-8x+8x=3+36\)

\(\Rightarrow0x=39\left(vô-lí\right)\)

\(b,1+x-2\left(5+3x\right)=4-5x\)

\(\Rightarrow1+x-10-6x=4-5x\)

\(\Rightarrow x-6x+5x=4+10-1\)

\(\Rightarrow0x=13\left(vô-lí\right)\)

\(c,3\left(2-x\right)+1=-3x+7\)

\(\Rightarrow6-3x+1=-3x+7\)

\(\Rightarrow-3x+3x=7-1-6\)

\(\Rightarrow0x=0\Rightarrow x=0\)