因式分解 n1.n2x^2+(n1.n2+m1.m2)xy+m1.m2y
1个回答
最后应该是y²
原式=n1n2x²+n1n2xy+m1m2xy+m1m2y²
=n1n2x(x+y)+m1m2y(x+y)
=(n1n2x+m1m2y)(x+y)
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