Вправи: 4.9

4.9 Спростіть:

1) m+2m2 – 1m = m+2-mm2 = 2m2;

2) 5n5 + 3-4n2n7 = 5n2+ 3-4n2n7 = n2+ 3n7;

3) x-yx2 – y-xxy = yx-y- x(y-x)x2y = xy- y2- xy+ x2x2y = x2- y2x2y;

4) c-2pcp2 + 2c-ppc2 = cc-2p+ p(2c-p)p2c2 = c2- 2cp+2cp- p2p2c2 = c2- p2p2c2.