3 |
4 |
6 |
7 |
A.
| B.a2 | C.2ab | D.-2a |
A.a2-(2a-b+c)=a2-2a-b+c |
B.(a+1)-(-b+c)=a+1+b+c |
C.3a-[5b-(2c-1)]=3a-5b+2c-1 |
D.a-b+c-d=a-(b+c-d) |
A.3a+6b=9ab | B.3a3b-3ba3=0 | ||||||
C.8a4-6a3=2a | D.
|
A.
| B.
| C.
| D.
|
A.5x-3x=2x2 | B.7y2-5y2=2 |
C.9a2b-4ba2=5a2b | D.2x+3y=5xy |
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