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问题 选择题
下列各式运算错误的是（　　）
A．（-a2b）2·（-ab2）3=-a7b8 B．（-a2b3）3÷（-ab2）3=a3b3
C．（-a3）2·（-b2）3=a6b6 D．[-（a3）2•（-b2）3]3=a18b18
答案

答案：C

填空题

微分方程xy’+2y=xlnx满足

的解为______．
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单项选择题

A car traveled 462 miles per tankful of gasoline on the highway and 336 miles per tankful of gasoline in the city. If the car traveled 6 fewer miles per gallon in the city than on the highway, how many miles per gallon did the car travel in the city ？（）

A．14

B．16

C．21

D．22

E．27
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