A.2m2-(3m+5)=2m2-3m-5 | B.x2-(3x-2)=x2-3x-2 |
C.7a+(5b-1)=7a+5b+1 | D.-(a-b)+(ab-1)=-a-b+ab-1 |
A.2x+3y=5xy | B.2a2+3a3=5a5 |
C.4a2-3a2=1 | D.-2ba2+a2b=-a2b |
A.0.2a2b与0.2ab2 | B.11abc与9bc |
C.3m2n3与-n3m2 | D.62与x2 |
A.(a+1)-(-b+c)=a+1+b+c | B.a2-2(a-b+c)=a2-2a-b+c |
C.a-2b+7c=a-(2b-7c) | D.a-b+c-d=(a-d)-(b+c) |
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