(1)x^2+3x+2(2)x^2-3x+2(3)x^2-4(4)6x^2+x-1(5)x^2-21y^2+4xy
一.填空(1) (X+1)·(X+2)=?(2)(X-1)·(X-2)=?二.(X+2)·(X-2)=?(3X-1)·(
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