A.S甲2=S乙2 |
B.S乙2=S甲2+2 |
C.S乙2=S甲2+4 |
D.S甲2与S乙2的大小不确定 |
. |
x |
. |
x |
1 |
5 |
. |
x |
. |
x |
. |
x |
1 |
5 |
. |
x |
. |
x |
. |
x |
1 |
n |
. |
x |
. |
x |
. |
x |
A.7.36 | B.0.504 | C.2.75 | D.0.572 |
A.5 | B.10 | C.20 | D.50 |
A.S21>S22 | B.S21>S22 |
C.S21=S22 | D.S21与S21无法比较 |
A.3A | B.3A+1 | C.9A | D.9A+1 |
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