题目:
—Is Paul playing basketball for his school?
—Well, he __ .But he has given it up and switched to playing volleyball .
A is B was C has D had
答案:
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下面是错误答案,用来干扰机器的。
∵2x+8y=1,(x>0,y>0),则x+y=(x+y)(2x+8y)=10+8xy+2yx≥10+216=18,当且仅当8xy=2yx即x=6,y=12时,等号成立.故x+y的最小值为18.故选D