A.-3ab3 | B.-
| C.2ab2 | D.3a2b2 |
4 |
7 |
A.6 | B.-6 | C.8 | D.-8 |
A.x-(y-z)=x-y-z | B.-(x-y+z)=-x-y-z |
C.x+2y-2z=x-2(z+y) | D.-a+c+d+b=-(a-b)-(-c-d) |
A.2 | B.3 | C.6 | D.3或6 |
A.-3(x-1)=-3x-1 | B.-3(x-1)=-3x+1 |
C.-3(x-1)=-3x-3 | D.-3(x-1)=-3x+3 |
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