A.不能运算 | B.-2 | C.-2yx2 | D.-2xy |
A.-5m2n+5nm2=0 | B.5x-x=5 |
C.3+2ab=5ab | D.x3-x=x2 |
A.3m2n3与-n3m2 | B.52yx与
| ||
C.122与-4
| D.62与x2 |
A.3x2y和-2x2y | B.-xy和2yx | ||
C.-1和1
| D.a2和32 |
A.2a2b+a2b=2a4b2 | B.2a2b-a2b=2 |
C.2a2b-a2b=a2b | D.2a2b+a2b=3a4b2 |
A.6a+a=6a2 | B.-2a+5b=3ab |
C.4m2n-2mn2=2mn | D.3ab2-5b2a=-2ab2 |
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