把x2-y2+2y-1分解因式结果正确的是( )A.(x+y+1)(x-y-1)B.(x+y-1)(x-y+1)C.(x+y-1)(x+y+1)D.(x-y+
题型:单选题难度:简单来源:不详
把x2-y2+2y-1分解因式结果正确的是( )A.(x+y+1)(x-y-1) | 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
原式=x2-(y2-2y+1) =x2-(y-1)2 =(x+y-1)(x-y+1), 故选B. |
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