3a+3b-21 |
6cd+3 |
3(a+b)-21 |
6cd+3 |
3×0-21 |
6×1-3 |
1 |
4 |
A.179 | B.181 | C.165 | D.167 |
x |
1×3 |
x |
3×5 |
x |
2007×2009 |
A.2007 | B.2009 | C.4014 | D.4018 |
1 |
1×2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
19×20 |
1 |
19 |
1 |
20 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
19×20 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
19 |
1 |
20 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
19 |
1 |
20 |
1 |
20 |
19 |
20 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
(n-1)×n |
1 |
2×4 |
1 |
4×6 |
1 |
6×8 |
1 |
98×100 |
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