A.a+(b-c+d)=a-b+c-d | B.a-(b-c+d)=a-b-c-d |
C.a-(b-c+d)=a-b+c-d | D.a-(b-c+d)=a-b-c+d |
A.-2x2y与xy2 | B.5x2y与-0.5x2z |
C.3mn与-4nm | D.-0.5ab与abc |
A.x-(y-z)=x-y-z | B.-(x-y+z)=x-y-z |
C.x-2(y+z)=x-2y-z | D.-3(x-y+1)=-3x+3y-3 |
2 |
3 |
A.0 | B.1 | C.
| D.3 |
2 |
3 |
3 |
5 |
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