9. Упростите данный многочлен, выполнив приведение подобных слагаемых:
1) a) -2a + 3b - 8a + 7b;

б) 3x2 - 5xy + 7xy - 10x2 + y";

b) 2x2y - 3ab3 - 4x2y - 5ab3.

2) a) 2a' - 3ab - 3a' + 7ab - 4b°;

б) -3c + 2d - 4c - 5d;

b) За*b - 4.xy2 - 5xy2 + 7a°b.​
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