Вправи: 824

824. Спростіть вираз:

1) (1x2- 7x+12 + 1x-3) • x2+ x-20x2- 25 = (1x-3(x-4) + 1\x-4x-3) • x+5(x-4)x-5(x+5) = 1+x-4x-3(x-4) • x-4x-5 = x-3x-3(x-4) • x-4x-5 = 1x-5.

2) 5x+1x2+ 9x-10 : 2x2- 4x-1x2- 2x+1 + 10x2+ 10x = 5x+1x+10(x-1) : 5x+1(x-1)(x-1)2 + 10x(x+10) = 5x+1x+10(x-1) • (x-1)25x+1(x-1) + 10x(x+10) = 1\xx+10 + 10x(x+10) = x+10x(x+10) = 1x.