求八年级因式分解习题(含答案)11道(越多越好,追加50分)
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发布时间:2024-10-06 01:50
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时间:2024-11-09 05:07
3(y-x)^2+2(x-y)
=(x-y)[3(x-y)+2]
=(x-y)(3x-3y+2)
2、10a(x-y)^2-5b(y-x)
=10a(x-y)^2+5b(x-y)
=5(x-y)[2a(x-y)+b]
=5(x-y)(2ax-2ay+b)
3、289(2x+y)^2-144(x-2y)^2
=[17(2x+y)+12(x-2y)][17(2x+y)-12(x-2y)]
=(46x-7y)(22x+41y)
4、4(x-y)^2(x+y)-6(y-x)^3
=4(x-y)^2(x+y)+6(x-y)^3
=2(x-y)^2(2x+2y+3x-3y)
=2(x-y)^2(5x-y)
5、a^2-b^2-2b-1
=a^2-(b^2+2b+1)
=a^2-(b+1)^2
=(a+b+1)(a-b-1)
6、361(2x+y)^2-121(x-2y)^2
=[19(2x+y)+11(x-2y)][19(2x+y)-11(x-2y)]
=(49x-3y)(27x+41y)
7、9a^2-6a+1
=(3a-1)^2