第一题.8(a-b)²-2(b-a)第二题.(x²+4y²)²-16x²y²
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第一题.8(a-b)²-2(b-a)第二题.(x²+4y²)²-16x²y²
第一题.8(a-b)²-2(b-a)
第二题.(x²+4y²)²-16x²y²
第一题.8(a-b)²-2(b-a)第二题.(x²+4y²)²-16x²y²
8(a-b)²-2(b-a)=2(b-a)[4(b-a)-1)=2(b-a)(4b-4a-1)
(x²+4y²)²-16x²y²=[(x²+4y²)+4xy)]((x²+4y²)-4xy)=[(x+2y)(x-2y)]²