Вправи: 69

69. Подайте у вигляді дробу вираз:

1) 7k18p – 4k18p = 7k-4k18p = 3k18p = k6p; 2) a-b2b – a2b = a-b-a2b = -b2b = –12;

3) a-12b27a + a+15b27a = a-12b+ (a+15b)27a = a-12b+a+15b27a = 2a+3b27a;

4) x-7yxy – x-4yxy = x-7y- (x-4y)xy = x-7y-x+4yxy = -3yxy = -3yxy = –3x;

5) 10a+6b11a3 – 6b-a11a3 = 10a+6b- (6b-a)11a3 = 10a+6b-6b+a11a3 = 11a11a3 = 11a11a3 = 1a2;

6) x2- xyx2y + 2xy-3x2x2y = x2- xy+ (2xy-3x2)x2y = x2- xy+2xy-3x2x2y = xy-2x2x2y = x(y-2x)x2y = y-2xxy.