A.5a+2a=7a | B.3ab-3ab=0 |
C.x+x+x=x3 | D.4x2y-5x2y=-x2y |
A.xny与-xnyn-1 | B.5x2yn-2与5y2xn-2 | ||||
C.-2xny与
| D.
|
A.x+y=2xy | B.6x2-5x2=1 |
C.4ab+3ab=7a2b2 | D.2m2n-m2n=m2n |
A.6a-2(3a-2b-c)=6a-6a+c |
B.(7x-3y)-3(a2-b)=7x-3y-3a2-3b |
C.a-(-b-c+d)=a+b+c-d |
D.(-a+1)+(-b-c)=a+1-b-c |
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