分解因式x2-4的结果是( )A.(x-4)(x+4)B.(x+2)(x-2)C.(x-2)(x-2)D.(x+2)(x+2)
题型:单选题难度:简单来源:不详
分解因式x2-4的结果是( )A.(x-4)(x+4) | B.(x+2)(x-2) | C.(x-2)(x-2) | D.(x+2)(x+2) |
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答案
x2-4=x2-22=(x+2)(x-2). 故选B. |
举一反三
(x-y)2-(y-x)因式分解的结果是( )A.(y-x)(x-y) | B.(x-y)(x-y-1) | C.(y-x)(y-x-1) | D.(x-y)(y-x-1) |
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若a-b=-3,b+c=4,则2b(a-b)-2c(b-a)=______. |
分解因式: (1)x-x3=______ (2)xy-x-y+1=______. |
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