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因式分解:(1)(-xy²)²*(x²y)三次方÷(x²y的五次)(2)3(x+1)²-5(x+1)(x-1)+2x(x-1)(3)8a三次-18a(4)2(a+b)²-a-b(5)(m/m-2-m/m+2)*2-m/m注明:这里的/

题目详情
因式分解:
(1)(-xy²)² * (x²y)三次方 ÷(x²y的五次) (2)3(x+1)²-5(x+1)(x-1)+2x(x-1)
(3)8a三次-18a (4)2(a+b)²-a-b
(5)(m/m-2 - m/m+2)* 2-m/m
注明:这里的/表示分数线,*表示乘号,如果可以每题至少2部,
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答案和解析
(1)(-xy²)² * (x²y)三次方 ÷(x²y的五次)
=x^2y^4*x^6y^3/(x^2y^5)
=x^6y^2
(2)3(x+1)²-5(x+1)(x-1)+2x(x-1)
=3(x+1)²-3(x+1)(x-1)-[2(x+1)(x-1)-2x(x-1)]
=3(x+1)[(x+1)-(x-1)]-2(x-1)[(x+1)-x]
=6(x+1)-2(x-1)
=4x+8
(3)8a三次-18a
=2a(4a²-9)
=2a(2a-3)(2a+3)
(4)2(a+b)²-a-b
=2(a+b)²-(a+b)
=(a+b)(2a+2b-1)
(5)[m/(m-2)- m/(m+2)]* (2-m)/m
=m/(m-2)* (2-m)/m- m/(m+2)* (2-m)/m
=-1-(2-m)/(m+2)
=-4/(m+2)