A.a2-(a-b+c)=a2-a-b+c | ||||
B.5+a-2(3a-5)=5+a-6a+10 | ||||
C.3a-
| ||||
D.a3-[a2-(-b)]=a3-a2+b |
1 |
3 |
2 |
3 |
口 |
3 |
A.4x和4y | B.4xy2和4xy |
C.4xy2和-8x2y | D.-4xy2和4xy2 |
A.2,3 | B.3,2 | C.-3,2 | D.3,-2 |
A.4x-9x+6x=-x | B.xy-2xy=3xy | ||||
C.x3-x2=x | D.
|
A.6a+a=6a2 | B.2a+b=2ab |
C.3ab2-5b2a=-2ab2 | D.4m2n-2mn2=2mn |
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