A.-(x-6)=-x-6 | B.-a+b=-(a+b) | C.30-x=5(6-x) | D.3(x-8)=3x-24 |
1 |
5 |
A.0 | B.x2 | C.y2 | D.z2 |
A.3xy2和5x2y | B.mn和3m | C.
| D.-6a和8a |
A.-xn+2yn与ynxn+2(n为正整数) | ||
B.5x2y与-3yx2 | ||
C.12与
| ||
D.0.1a2b与0.2ab2 |
A.-7与2.1 | B.a2b与ab2 | C.2xy与-5yx | D.mn2与3n2m |
5 |
2 |
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