5 |
2 |
5 |
2 |
5 |
2 |
15 |
2 |
15 |
2 |
2 |
3 |
A.
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B.
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C.-0.5x3y2和2x2y3是同类项 | ||||
D.5m2n与-2nm2是同类项 |
A.b3与a3 | B.a2b与-ba2 | C.x2y与x2yz | D.2m2n与2mn2 |
A.3x2-2x2=1 | B.-3ab+3ab=0 |
C.y2+y2=y4 | D.4mn2-5m2n=-m2n |
A.a+a=2a2 | B.a5-a2=a3 |
C.3a+b=3ab | D.a2-3a2=-2a2 |
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