9(x-y)的2次方-25(x-y)的2次方因式分解
问题描述:
9(x-y)的2次方-25(x-y)的2次方因式分解
答
9(x-y)²-25(x-y)²
=[3(x-y)]²-[5(x-y)]²
=[3(x-y)+5(x-y)][3(x-y)-5(x-y)]
=(8x-8y)(-2x+2y)
=-16(x-y)²
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