Вправи: 68

68. Виконайте дії:

1) x6 + y6 = x+y6; 2) a3 – b3 = a-b3; 3) mn + 4mn = 5mn;

4) 6cd – 2cd = 4cd;

5) m+n6 – m-2n6 = m+n- (m-2n)6 = m+n-m+2n6 = 3n6 = n2;

6) 2a-3b6ab + 9b-2a6ab = 2a-3b+ (9b-2a)6ab = 2a-3b+9b-2a6ab = 6b6ab = 1a;

7) 5c+4dcd + 4d+9ccd = 5c+4d+ (4d+9c)cd = 5c+4d+4d+9ccd = 14c+8dcd;

8) 8m+310m2 – 2m+310m2 = 8m+3- (2m+3)10m2 = 8m+3-2m-310m2 = 6m10m2 = 35m.