化简,并求值2(x-2y)²-4(x+3y)(x-3y)-2(x-y).(y+x)-5(-x-1)²
1个回答
2(x-2y)²-4(x+3y)(x-3y)-2(x-y).(y+x)-5(-x-1)²,
=2(x²+4y²-4xy)-4(x²-9y²)-2(x²-y²)-5(x²+1+2x)
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