A.3a•2a=5a | B.3a•2a=5a2 | C.3a•2a=6a | D.3a•2a=6a2 |
A.x(x﹣1)=x2﹣1 | B.x2﹣x=x(x+1) |
C.x2+x=x(x+1) | D.x2﹣x=x(x+1)(x﹣1) |
A.x•x2=x2 | B.(xy)2=xy2 | C.(x2)3=x6 | D.x2+x2=x4 |
A.a2(a﹣2)+a | B.a(a2﹣2a) |
C.a(a+1)(a﹣1) | D.a(a﹣1)2 |
A.52•53=56 | B.(52)3=55 | C.52÷53=5 | D. |
© 2017-2019 超级试练试题库,All Rights Reserved.