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陈向东数学第四篇-37题
Candy hearts were marked down from 30% to 50% on Valentine's day. The following day, candy hearts were marked down an additional 25%. What was the lowest cost of a candy heart that originally sold for 28 USD?
A)7 B)12.60 C)14 D)15.40 E)21 书上给出的答案是A,无解析。 我怎么算都是28*0.5*0.75=10.5
陈向东数学第四篇-49题 (方框、三角、菱形代表三个不同的非零数字) The product of the two-digit numbers (方框三角 乘以 三角方框) is the three-digit number 方框菱形方框, where 方框、三角、菱形 are three different nonzero digits. If 方框 乘以 三角 < 10, what is the two-digit number 方框三角?
A)11 B)12 C)13 D)21 E)31
判断三角是1很明显,但是方框? 哪位能帮忙给一个系统的推倒! 谢谢! |
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