1 |
9 |
1 |
1×2 |
1 |
2×3 |
1 |
8×9 |
1 |
1×2 |
1 |
2×3 |
1 |
8×9 |
9×10 |
2 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
8 |
1 |
9 |
17 |
9 |
1 |
9 |
1 |
2 |
1 |
4 |
1 |
2 |
A.-x-
| B.-x+
| C.3x-
| D.3x+
|
A.a+(-2b+c-3d)=a+2b+c-3d |
B.a-(-2b+c-3d)=a+2b-c+3d |
C.a-2(-2b+c-3d)=a+4b+2c-6d |
D.a-2(-2b+c-3d)=a+4b-c+3d |
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