A.2a+b=2ab | B.-5a2+3a2=-2 | ||||
C.3x2y-3xy2=0 | D.
|
A.a2b | B.-3ab2 | C.
| D.a2b2 |
A.52与-5 | B.3x2y与3xy2 | C.a与1 | D.2bc与2abc |
A.2x2+3x2=5x4 | B.2x2-3x2=-x2 |
C.6a3+4a4=10a3 | D.8a2b-8b2a=0 |
A.3a2-a2=2a2 | B.5xy-y=5x |
C.3m+3n=6mn | D.-2a2b+2ab2=0 |
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