今天小编为大家带来的就是关于大家在面对新SAT难解的数学题的时候该怎么办?顺便今天小编也是盘点了一些在sat数学考试中的比较难的几种题型,希望今天带来的内容对大家的备考有所帮助!
The recommended daily calcium intake for a 20-year-old is 1,000 milligrams (mg). One cup of milk contains 299 mg of calcium and one cup of juice contains 261 mg of calcium. Which of the following inequalities represents the possible number of cups of milk m and cups of juice j a 20-year-old could drink in a day to meet or exceed the recommended daily calcium intake from these drinks alone?
A 299m+261j≧1000
B 299m+261j>1000
C 299/m+261/j≧1000
D 299/m+261/j>1000
这道题考察的是很简单的核心代数问题,属于对现实问题的数学建模。这道题选A ,从题目中“meet or exceed the recommended daily calcium intake ”可以明显看出来需要使用“大于等于号”而不是“大于号”,因此可以首先排除B和D选项。一杯牛奶含有299mg的钙质,一杯果汁含有261mg的钙质。所以m杯牛奶和j杯果汁一共含有299m+261j的钙质。因此答案是选A.
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