把-6(x-y)3-3y(y-x)3分解因式,结果是( )A.-3(x-y)3(2-y)B.-(x-y)3(6-3y)C.3(x-y)3(y+2)D.3(x-
题型:单选题难度:一般来源:不详
把-6(x-y)3-3y(y-x)3分解因式,结果是( )A.-3(x-y)3(2-y) | B.-(x-y)3(6-3y) | C.3(x-y)3(y+2) | D.3(x-y)3(y-2) |
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答案
-6(x-y)3-3y(y-x)3 =-6(x-y)3+3y(x-y)3 =-3(x-y)3(2-y). 故选A. |
举一反三
下列由左到右的变形是分解因式的是( )A.(x+1)(x-1)=x2-1 | B.x2-=(x+)(x-) | C.3x3-6x2+4=3x2(x-2)+4 | D.x2+x+=(x+)2 |
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下列各式中不能用平方差公式分解因式的是( )A.-a2+b2 | B.(x+2y)2-(2x-y)2 | C.-0.012-0.09y2 | D.2x2-y2 |
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