2. 外语
  3. If and xy=4, then 7y+2x=

If and xy=4, then 7y+2x=

admin2011-02-20  10
问题 If and xy=4, then 7y+2x=
选项 A、 
B、 
C、 
D、 
E、 
答案A
解析 If you multiply xy times both sides of the first equation, you get 7y+2x=7xy. You know that xy=4, so 7y+2x=7(4)=28.
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