A.9a2+y2 | B.-9a2+y2 | C.9a2-y2 | D.-9a2-y2 |
A.4 | B.1 | C.-1 | D.0 |
A.x(x-4)+4 | B.(x-2)(x+2) | C.(x-2)2 | D.(z+2)2 |
A.(3-x)2 | B.(3+x)(3-x) | C.(9-x)2 | D.(9+x)(9-x) |
A.(x+2)2 | B.(x-2)2 | C.x(x-4)+4 | D.(x+2)(x-2) |
A.4(1-a)+a2 | B.(2-a)2 | C.(2-a)(2+a) | D.(2+a)2 |
© 2017-2019 超级试练试题库,All Rights Reserved.