1+2 |
1+2+1 |
3 |
4 |
1+2+3 |
1+2+3+2+1 |
6 |
9 |
2 |
3 |
1+2+3+4 |
1+2+3+4+3+2+1 |
10 |
16 |
5 |
8 |
1+2+3+4+5+6+7+8+9 |
1+2+3+4+5+6+7+8+9+8+7+6+5+4+3+2+1 |
45 |
81 |
5 |
9 |
3 |
4 |
2 |
3 |
5 |
8 |
5 |
9 |
A.1 | B.2 | C.3 | D.4 |
A.0.5cm2 | B.1cm2 | C.2cm2 | D.4cm2 |
A.2cm2 | B.1cm2 | C.0.5cm2 | D.0.25cm2 |
A.9 | B.5 | C.4.5 | D.4 |
A.4acm2 | B.2acm2 |
C.acm2 | D.以上答案都不正确 |
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