把x2-1+2xy+y2的分解因式的结果是( )A.(x+1)(x-1)+y(2x+y)B.(x+y+1)(x-y-1)C.(x-y+1)(x-y-1)D.(
题型:单选题难度:一般来源:不详
把x2-1+2xy+y2的分解因式的结果是( )A.(x+1)(x-1)+y(2x+y) | B.(x+y+1)(x-y-1) | C.(x-y+1)(x-y-1) | D.(x+y+1)(x+y-1) |
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答案
x2-1+2xy+y2, =(x2+2xy+y2)-1, =(x+y)2-1, =(x+y+1)(x+y-1). 故选D. |
举一反三
分解因式 (1)ax2-16ay2(2)-2a3+12a2-18a |
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