(1)原式=3xy+10y+5x-（2xy+2y-3x）=3xy+10y+5x-2xy-2y+3x=xy+8x+8y=xy+8(x+y)当xy=-2,x+y=3时,原式=xy+8(x+y)=-2+8*3=22（2）原式=6a^2-a^2-5a^2+2a+2a^2-6a=2a^2-4a当a^2-2a-3=0时,a^2-2a=3,原式=2a^2-4a=2*3=6（3...
初一整式（3xy+10y）＋[5x-（2xy+2y-3x）],其中xy=-2,x+y=3.
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