Объяснение:
1.= ab+ac+db+dc
2.=5ax+5ay-3dx-3dy.
3.6a²-6ac+7dc+7da.
4.9xb-9xc-2yc+2yb.
5.x³+x²y+y²x-y³.
6.9b³+3b²a+3ba²+a³.
7.4x-4y-3x²+3y².
8.2x²-2xy-x²+y²=x²-2xy+y²
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Объяснение:
1.= ab+ac+db+dc
2.=5ax+5ay-3dx-3dy.
3.6a²-6ac+7dc+7da.
4.9xb-9xc-2yc+2yb.
5.x³+x²y+y²x-y³.
6.9b³+3b²a+3ba²+a³.
7.4x-4y-3x²+3y².
8.2x²-2xy-x²+y²=x²-2xy+y²