1 |
1×2 |
1 |
2 |
1 |
2×3 |
1 |
2 |
1 |
3 |
1 |
3×4 |
1 |
3 |
1 |
4 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
9×10 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
(n-1)n |
1 |
1×5 |
1 |
5×9 |
1 |
9×13 |
x |
1×5 |
x |
5×9 |
x |
9×13 |
x |
2009×2013 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
9×10 |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
9 |
1 |
10 |
1 |
10 |
9 |
10 |
1 |
1×2 |
1 |
2×3 |
1 |
3×4 |
1 |
(n-1)n |
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
n-1 |
1 |
n |
1 |
n |
n-1 |
n |
1 |
1×5 |
1 |
5×9 |
1 |
9×13 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
9 |
1 |
9 |
1 |
13 |
1 |
4 |
12 |
13 |
3 |
13 |
x |
1×5 |
x |
5×9 |
x |
9×13 |
x |
2009×2013 |
1 |
4 |
1 |
5 |
1 |
5 |
1 |
9 |
1 |
9 |
1 |
13 |
1 |
2009 |
1 |
2013 |
1 |
4 |
2012 |
2013 |
A.-4-4=0 | B.(-4)×(-9)=-36 | C.(-12)÷3=-4 | D.(-3)3+9=0 |
A.78.5 | B.15.7 | C.314 | D.31.4 |
1 |
4 |
1 |
2 |
3 |
4 |
3 |
4 |
1 |
2 |
1 |
4 |
1 |
4 |
4 |
9 |
1 |
2 |
1 |
4 |
32 |
4 |
4 |
3 |
1 |
2 |
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