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:一般来源:自贡
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) |
|
答案
原式=x2-(y2+2y+1), =x2-(y+1)2, =(x+y+1)(x-y-1). 故选A. |
举一反三
分解因式:x2-2xy+y2+x-y的结果是( )A.(x-y)(x-y+1) | B.(x-y)(x-y-1) | C.(x+y)(x-y+1) | D.(x+y)(x-y-1) |
|
将多项式a2-9b2+2a-6b分解因式为( )A.(a+2)(3b+2)(a-3b) | B.(a-9b)(a+9b) | C.(a-9b)(a+9b+2) | D.(a-3b)(a+3b+2) |
|
把45ab2-20a分解因式的结果是______. |
把多项式a2-2ab+b2-1分解因式,结果是( )A.(a-b+1)(a-b-1) | B.(a-b+1)(a+b-1) | C.(a+b+1)(a+b-1) | D.(a+b+1)(a-b-1) |
|
最新试题
热门考点