Вправи: 203

203. Спростіть вираз:

1) 14a2b25xy • 10x2y321a2b3 • 3b34y = 14a2b2 • 10x2y3• 3b25xy •21a2b3 •4y = 12a2b4x2y312a2b3xy2 = bxy;

2) x2+ y2+ 2xyx2- y2 • x3- y3xy+ x2+y2 = (x2+ y2+ 2xy) •(x3- y3)(x2- y2) •(xy+ x2+ y2) = (x+y)2 •x-y(x2+ xy+ y2)x-yx+y(x2+ xy+ y2) = x + y.