(一)分解因式:(1)2a2,b2-8ab2(2)15(x-y)-60y(x-y) (3) a(X-3)+2b(3-x) (4) 5(y-x)3+10(x-y)2
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:
(1)2a²b²-8ab²
=2ab²(a-4)
(2)15(x-y)-60y(x-y)
=15(x-y)(1-4y)
(3) a(X-3)+2b(3-x)
=a(x-3)-2b(x-3)
=(x-3)(a-2b)
(4) 5(y-x)³+10(x-y)²
=5(y-x)³+10(y-x)²
=5(y-x)²(y-x+2)
(5)x²+3x=x(x+3)
(6)2x²-6x=2x(x-3)
(3)12a³b-15a²b³=3a²b(4-5b²)
(1)2a²b²-8ab²
=2ab²(a-4)
(2)15(x-y)-60y(x-y)
=15(x-y)(1-4y)
(3) a(X-3)+2b(3-x)
=a(x-3)-2b(x-3)
=(x-3)(a-2b)
(4) 5(y-x)³+10(x-y)²
=5(y-x)³+10(y-x)²
=5(y-x)²(y-x+2)
(5)x²+3x=x(x+3)
(6)2x²-6x=2x(x-3)
(3)12a³b-15a²b³=3a²b(4-5b²)
追问
9-2)2011+(-2)2012
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