A.-32=9 | B.mn+mn=m2n2 | ||||
C.326000=3.26×106 | D.(-
|
2 |
3 |
8 |
27 |
1 |
2 |
1 |
4 |
2 |
3 |
5 |
6 |
1 |
2 |
A.a2-(2a-b2+b)=a2-2a-b2+b |
B.-(2x+y)-(-x2+y2)=-2x+y+x2-y2 |
C.2x2-3(x-5)=2x2-3x+5 |
D.-a3-[-4a2+(1-3a)]=-a3+4a2-1+3a |
A.-x2y和xy2 | B.x2y和x2z |
C.-m2n3和-n3m2 | D.-ab和abc |
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