Вправи: 119

119. Зведіть дріб:

1) 1\2a+b = 22(a+b); 1\a+ba+b = a+b(a+b)2;

1\3aa+b = 3a3a(a+b); 1\a-ba+b = a-ba2- b2

2) 5x\2x-y = 10x2(x-y); 5x\x-yx-y = 5x2- 5xy(x-y)2;

5x\4yx-y = 20xy4y(x-y); 5x\x+yx-y = 5x2+ 5xyx2- y2.

3) 3m-2n\72(m+n) = 21m-14n14(m+n);

3m-2n\4(m+n)2(m+n) = 3m-2n(4m+4n)8(m+n)2 = 12m2+ 12mn-8mn- 8n28(m+n)2 = 12m2+ 4mn- 8n28(m+n)2.