A.3x2y与-6xy2 | B.-ab3与b3a | ||
C.12和0 | D.2xyz与-
|
A.ab和-ba | B.
| ||||
C.-5和
| D.x2y和a2b |
1 |
2 |
1 |
2 |
1 |
3 |
A.①②③ | B.②④ | C.②④⑤ | D.②③⑤ |
1 |
3 |
A.7x-(-3x)=10 | B.5a+6b=11ab | C.ab+2ba=3ab | D.-(a-b)=a+b |
A.a+(b+c-d)=a+b+c-d | B.a-(b-c+d)=a-b+c-d |
C.a-b-(c-d)=a-b-c-d | D.a+b-(-c-d)=a+b+c+d |
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