1 |
3 |
A.3ab+3ac=6abc | B.4a2b-4b2a=0 |
C.2x2+7x2=9x4 | D.3y2-2y2=y2 |
A.2a3b与-3ba3 | B.-3与0 | ||||
C.6a2m与-9a2m | D.
|
A.3和0 | B.2πR2与π2R2 |
C.xy与2pxy | D.-xn+1yn-1与3yn-1xn+1 |
A.a-(b+c)=a-b-c | B.a+(b-c)=a+b+c |
C.a-(b+c)=a-b+c | D.a-(b+c)=a÷b-c |
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