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A.2a-(3a-c)=2a-3b-c | B.3a+2(2b-1)=3a+4b-1 |
C.a+2b-3c=a+(2b-3c) | D.m-n+a-b=m-(n+a-b) |
A.5a2-2a2=3 | B.a2-2a2=-a2 | C.2m+3m2=5m3 | D.3+a2=3a2 |
A.a2-(2a-b+c)=a2-2a-b+c | B.(a+1)-(-b+c)=a+1+b+c |
C.3a-5(b+1)=3a-5b-5 | D.-2(a-b)=-2a-2b |
A.0.3m2n3与-n2m3 | B.a3与5a3 | ||||
C.-3×104和
| D.
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A.-(3x+2)=-3x+2 | B.-(-2x-7)=-2x+7 |
C.-(3x-2)=-3x+2 | D.-(-2x-7)=2x-7 |
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