A.(x+1)(1+x) | B.(
| C.(-a+b)(a-b) | D.(x2-y)(x+y2) |
1 |
2 |
1 |
2 |
A.-x2+y2 | B.-x2-y2 | C.x2-y2 | D.x2+y2 |
A.(a+b)(a+b) | B.(a-b)(b-a) | C.(a-b)(-b+a) | D.(a-b)(-a-b) |
A.(m-n)(n-m) | B.(a+b)(-a-b) | C.(-a-b)(a-b) | D.(a+b)(a+b) |
A.0 | B.2 | C.4 | D.6 |
99×101+1 |
251-247 |
© 2017-2019 超级试练试题库,All Rights Reserved.