AI 的题目不在题库里面好像 How effectively students learn in class depends on the quality of other students than on the teacher. 我是赞同。理由是Competition &group work等 数学 1。考了一道GWD原题一模一样答案是A: 第十五套Q24:
2。The buyer for a departmental company买了100条dress和150件blouse,共花了15500刀.已知average (arithmetic mean) price of dress is $30 higher than the average price of blouse.然后卖的时候比buyer买的价格高60%.问average selling price of one dress and one blouse. Let average price of dress be X and blouse be Y 100X+150Y=15500 X-Y=30 so Y=50, X=80 答案是(X+Y)*1.6=208