1) (x – 3)(x + 7) - (x + 7)(x – 8) = 0; 2) (4x -9)(x - 2) + (1 - x)(x - 2) = 0;
3) 0,2x (x – 5) + 8(x – 5) = 0;
4) 7(x – 7) - (x – 7)2 = 0.

Question

Математика: 1) (x – 3)(x + 7) - (x + 7)(x – 8) = 0; 2) (4x -9)(x - 2) + (1 - x)(x - 2) = 0;3) 0,2x (x – 5) + 8(x – 5) = 0;4) 7(x – 7) - (x – 7)2 = 0.​

angeldeikina · Answer

1) х=-72) х₁=2; х₂=3) х₁=-40; х₂=54) х=7Пошаговое объяснение:1)(x – 3)(x + 7) - (x + 7)(x – 8) = 0(x+7)×(x-3-(x-8)) = 0 (x+7)×(-3+8) = 0(x+7)×5 = 05х+35=05х=-7х=-72) (4x -9)(x - 2) + (1 - x)(x - 2) = 0(х-2)×(3х-8)=0х-2=0         3х-8=0х₁=2;           х₂=...

1) (x – 3)(x + 7) - (x + 7)(x – 8) = 0; 2) (4x -9)(x - 2) + (1 - x)(x - 2) = 0;3) 0,2x (x – 5) + 8(x – 5) = 0;4) 7(x – 7) - (x – 7)2 = 0.​

1) (x – 3)(x + 7) - (x + 7)(x – 8) = 0; 2) (4x -9)(x - 2) + (1 - x)(x - 2) = 0;
3) 0,2x (x – 5) + 8(x – 5) = 0;
4) 7(x – 7) - (x – 7)2 = 0.