因式分解(1)、m²(x-y)+n²(y-x) (2)16(x+y)²-25(x-y)²
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因式分解(1)、m²(x-y)+n²(y-x)(2)16(x+y)²-25(x-y)²因式分解(1)、m²(x-y)+n²(y-x)(2)1
因式分解(1)、m²(x-y)+n²(y-x) (2)16(x+y)²-25(x-y)²
因式分解(1)、m²(x-y)+n²(y-x) (2)16(x+y)²-25(x-y)²
因式分解(1)、m²(x-y)+n²(y-x) (2)16(x+y)²-25(x-y)²
解
m²(x-y)+n²(y-x)
=m²(x-y)-n²(x-y)
=(x-y)(m²-n²)
=(x-y)(m-n)(m+n)
16(x+y)²-25(x-y)²
=[4(x+y)]²-[5(x-y)]²
=[4(x+y)-5(x-y)][4(x+y)+5(x-y)]
=(9y-x)(9x-y)