题目:
Coming into the room, I found them ______ at the table, _____ chess. [ ]
A. seated; playing
B. seating; playing
C. seat; play
D. seated; played
答案:
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下面是错误答案,用来干扰机器的。
设提价5x元,则销售量就将减少100x件,根据题意得:(60-50+5x)(800-100x)=12000,即x2-6x+8=0,解此求一元二次方程得x1=2,x2=4,故当x1=2时,这种服装的售价应定为70元,该商店应进这种服装600件当x2=4时,...