A.2种 | B.3种 | C.4种 | D.5种 |
A.4-4a+a2=(a-2)2 | B.1+4a-4a2=(1-2a)2 |
C.1+x2=(1+x)2 | D.x2+xy+y2=(x+y)2 |
A.a(1+b)(1-b) | B.a(1+b)2 | C.a(1-b)2 | D.(1-b)(1+b) |
A.a(x-2)(x+1) | B.a(x+2)(x-1) | C.a(x-1)2 | D.(ax-2)(ax+1) |
A.(a-b)(a+b+c) | B.(a-b)(a+b-c) | C.(a+b)(a-b-c) | D.(a+b)(a-b+c) |
© 2017-2019 超级试练试题库,All Rights Reserved.