(1)16-(2a+3b)²(2)-36x²+12xy-y²(3)4x(a-b)-8y(b-a)4)(x²-5)²+(x²-5)+16
问题描述:
(1)16-(2a+3b)²(2)-36x²+12xy-y²(3)4x(a-b)-8y(b-a)
4)(x²-5)²+(x²-5)+16
答
您好:
(1)16-(2a+3b)²
=(4+2a+3b)(4-2a-3b)
(2)-36x²+12xy-y²
=-(36x²-12xy+y²)
=-(6x-y)²
(3)4x(a-b)-8y(b-a)
=4x(a-b)+8y(a-b)
=4(a-b)(x+2y)
4)(x²-5)²+8(x²-5)+16
=(x²-5+4)²
=(x²-1)²
=(x+1)²(x-1)²
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