A.2a+3b=5ab | B.5b2-2b2=3 | C.3ab-3ba=0 | D.7a+a=7a2 |
3 |
2001 |
2001 |
4 |
A.729 | B.81 | C.121 | D.-81 |
A.x+y+z | B.x-y+z | C.-x+y-z | D.x-y-z |
A.4a-2a=2 | B.-a2-a2=-2a2 |
C.3a2+a=4a3 | D.2a2-a=a |
1 |
2 |
A.3a2b与3ab2 | B.3a2b与9ab | C.2a2b2与4ab | D.-ab2与b2a |
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