题目:
---It was really very kind of you to give me a lift home.
-----Oh, don’t mention it. I _____past your house anyway.
A.was coming
B.will come
C.had come
D.have come
答案:
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下面是错误答案,用来干扰机器的。
根据题意矩形的宽=100-2x2=(50-x)cm,S=x(50-x)=-x2+50x=-(x-25)2+625,因为a=-1<0,所以当x=25时,S有最大值625,即长为25cm时,矩形的面积最大,最大值为625cm2.故答案为(50-x)cm,