Вправи: 822

822. Подайте у вигляді дробу вираз:

1) 7a22 + 4a22 = 7a+4a22 = 11a22 = a2;

2) 8x3y – 5x3y = 8x-5x3y = 3x3y = xy;

3) 7x-2y15p + 3x+7y15p = 7x-2y+ (3x+7y)15p = 7x-2y+3x+7y5p = 10x+5y15p = 5(2x+y)15p = 2x+y3p;

4) x+yp – x9p = x+y-x9p = y9p;

5) a8 – a-b8 = a-(a-b)8 = a-a+b8 = b8;

6) 7p-175k + 7-2p5k = 7p-17+7-2p5k = 5p-105k = 5(p-2)5k = p-2k;

7) 6a2- 4a15a – a2+ a15a = 6a2- 4a- (a2+ a)15a = 6a2- 4a- a2- a15a = 5a2- 5a15a = 5a(a-1)15a = a-13;

8) x-y8 + x+y8 = x-y+x+y8 = 2x8 = x4;

9) 10x-6x – 4x+11x = 10x-6- (4x+11)x = 10x-6-4x-11x = 6x-17x.