1+2 |
2 |
1+2+3 |
2+3 |
1+2+3+4 |
2+3+4 |
1+2+3+…+1993 |
2+3+…+1993 |
1+2+3+…+n |
2+3+…+n |
| ||||
2 |
3 |
2 |
| ||
|
| ||
|
| ||
|
1993 |
665 |
1993 |
665 |
3.6×2.1+3.5×2.4 |
10.5×7.2 |
-
| ||
-
|
A.
| B.-
| C.-2 | D.2 |
(-135)×(-271)+136 |
(-136)×(-271)-135 |
2 |
1×(1+2) |
3 |
(1+2)×(1+2+3) |
4 |
(1+2+3)×(1+2+3+4) |
10 |
(1+2+3+…+9)×(1+2+3+…+10) |
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