A.a3+a2=a5 | B.(3a-b)2=9a2-b2 |
C.(-ab3)2=a2b6 | D.a6b÷a2=a3b |
a-b |
a |
2ab-b2 |
a |
3 |
A.-22=-4 | B.-(-2)2=4 | C.(-3)2=6 | D.(-1)3=-3 |
1 |
2 |
1 |
2 |
A.30° | B.45° | C.60° | D.90° |
3 |
3xy-x2y2 |
xy-1 |
1 |
xy |
A.(-2)3与-23 | B.-32与(-2)3 |
C.(-3)2与-32 | D.(-3×2)3与-3×23 |
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