A.σ1<σ2 | B.σ1=σ2 |
C.σ1>σ2 | D.不能确定σ1、σ2的大小 |
. |
x |
. |
x |
1 |
n |
. |
x |
. |
x |
. |
x |
1 |
n |
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x |
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x |
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x |
1 |
n |
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x |
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x |
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x |
A.5.47 | B.29.92 | C.5.40 | D.5.630 |
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 |
A.7.36 | B.0.504 | C.2.75 | D.0.572 |
A.5 | B.10 | C.20 | D.50 |
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