Bài 11: Tìm x biết
1) (3x-1)(2x+7)-(x+1)(6x-5)=7
2) (3x+2)(2x+9)-(x+2)(6x+1)=7
3) (12x-5)(4x-1)+(3x-7)(1-16x)=81
4) 2(3x-1)(2x+5)-6(2x−1)(x+2)=-6
5) (2x-1)(3-x)+(x-2)(x+3)=(1-x)(x-2)
6) (2x+3)(x-4)+(x-5)(x-2)=(3x-5)(x-4)
7) (8x-3)(3x+2)-(4x+7)(x+4)=(2x+1)(5x-1)-33
Bài 12: Chứng minh rằ ...
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