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外语
2x +5y = 24 l≤x≤3 Column A Column B x y
2x +5y = 24 l≤x≤3 Column A Column B x y
admin
2009-05-19
33
问题
2x +5y = 24 l≤x≤3
Column A Column B
x y
选项
A、if the quantity in Column A is greater
B、if the quantity in Column B is greater
C、if the two quantity are equal
D、if the relationship cannot be determined from the information given
答案
B
解析
本题的正确答案为(B)。因为2x+5y=24是一条直线方程,因此考生可以用边界条件法进行求解,所谓边界条件法,就是只取x区间的两端判断y的区间:z=1时,y=5.4;x=3时,y=3.6,由此可以得出:3.6≤y≤5.4
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