Ответ:
1) (a-b)+(-b+a)=a-b-b+a=2a-2b
(a-b)-(-b+a)=a-b+b-a=0
3) a) -3x³+19x³+4x²-8x²+3x²=16x³-x²
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Ответ:
1) (a-b)+(-b+a)=a-b-b+a=2a-2b
(a-b)-(-b+a)=a-b+b-a=0
3) a) -3x³+19x³+4x²-8x²+3x²=16x³-x²