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(m+2)^2-9(m-1)^2(x-y)(x^2+xy+y^2)-xy(y-x)3(x-1)^2-18(x-1)+279*1.2^2-16*1.4^2
题目详情
(m+2)^2-9(m-1)^2 (x-y)(x^2+xy+y^2)-xy(y-x)
3(x-1)^2-18(x-1)+27 9*1.2^2-16*1.4^2
3(x-1)^2-18(x-1)+27 9*1.2^2-16*1.4^2
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答案和解析
(m+2)^2-9(m-1)^2 平方差 =[(m+2)-3(m-1)][(m+2)+3(m-1)]=(m+2-3m+3)(m+2+3m-3)=(5-2m)(4m-1) (x-y)(x^2+xy+y^2)-xy(y-x)提取公因式 =(x-y)(x^2+xy+y^2)+xy(x-y)=(x-y)[(x^2+xy+y^2)+xy]=(x-y)(x^2+xy+y^2+xy...
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