5,6题分解因试
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5,6题分解因试
5.原式=3a(x²-2xy+y²)
=3a(x-y)²
6.原式=[5(y-x)]²+2×5×(y-x)+1
=【5(y-x)+1】²
=(5y-5x+1)²
5.=3a(x-y)²
6.=[5(x-y)+1]²
5,6题分解因试
5.原式=3a(x²-2xy+y²)
=3a(x-y)²
6.原式=[5(y-x)]²+2×5×(y-x)+1
=【5(y-x)+1】²
=(5y-5x+1)²
5.=3a(x-y)²
6.=[5(x-y)+1]²