a)3(2x-1)-2(1-x)=x+9 b)-3(2x-1)-2(1-x)=x+9(1-x) c)(1-x)(2x-1)-2(2-x)(2+x)=x+9

Bạn tham khảo nhé

a)     3(2x – 1) – 2(1 – x) = x + 9

<=> 6x – 3 – (2 – 2x) = x + 9

<=> 6x – 3 – 2 + 2x – x = 9

<=>      7x = 14

<=>        x = 2

Vậy x = 2

b)     -3(2x – 1) – 2(1 – x) = x + 9(1 – x)

<=> -6x + 3 – (2 – 2x) = x + 9 – 9x

<=> -6x + 3 – 2 + 2x – x + 9x = 9 

<=> 4x = 8

<=>   x = 2

Vậy x = 2

c)     (1 – x)(2x – 1) – 2(2 – x)(2 + x) = x + 9

<=> 2x – 1 – 2x² + x – (4 – 2x)(2 + x) – x = 9

<=> 2x – 1 – 2x² + x – (8 + 4x – 4x – 2x²) – x = 9

<=> 2x – 1 – 2x² + x – 8 – 4x + 4x + 2x² – x = 9

<=> 2x = 18

<=>   x = 9

Vậy x = 9