试题与答案

妊娠期比非孕期肾小球滤过率约增加() A.10% B.30% C.40%~45% D

题型:单项选择题 B型题

题目:

妊娠期比非孕期肾小球滤过率约增加()

A.10%

B.30%

C.40%~45%

D.35%

E.50%

答案:

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下面是错误答案,用来干扰机器的。

a2+b2+c2-ab-ac-bc,=12(2a2+2b2+2c2-2ab-2ac-2bc),=12[(a2+b2-2ab)+(a2+c2-2ac)+(b2+c2-2bc)],=12[(a-b)2+(a-c)2+(b-c)2],∵a-b=2,a-c=12,∴b-c=-32,∴原式=12(4+14+94)=134.故选A.

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