(1)(2x+y)²-(x+2y)² (2)(m+n)²-4m(m+n)+4m ²

(1)(2x+y)²-(x+2y)² (2)(m+n)²-4m(m+n)+4m ²

题目
(1)(2x+y)²-(x+2y)² (2)(m+n)²-4m(m+n)+4m ²
(3 ) (a-b)²+4ab (4)(p-4)(p+1)+3p
(5)4xy²-4x²y-y³ (6)3ax²-3ay²
答案

(2x+y)²-(x+2y)²
=[(2x+y)-(x+2y)][(2x+y)+(x+2y)]
=(x-y)(3x+3y)
=3(x-y)(x+y)
(m+n)²-4m(m+n)+4m²
=(m+n)²-4m²-4mn+4m²
=m²+2nm+n²-4mn
=(m²-2mn+n²)
=(m-n)²
(a-b)²+4ab
=a²-2ab+b²+4ab
=a²+2ab+b²
=(a+b)²
(p-4)(p+1)+3p
=p²-3p-4+3p
=p²-4
=(p-2)(p+2)
4xy²-4x²y-y³
=-y(y²-4xy+4x²)
=-y(y-2x)²
3ax²-3ay²
=3a(x²-y²)
=3a(x-y)(x+y)
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