2. 外语
  3. Which of the following is the coefficient of xy in(3x+4y-xy)(4x+3y+1)?

Which of the following is the coefficient of xy in(3x+4y-xy)(4x+3y+1)?

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问题 Which of the following is the coefficient of xy in(3x+4y-xy)(4x+3y+1)?
选项 A、9
B、24
C、16
D、15
E、25
答案B
解析 题目中问的是xy项的系数，没有必要把(3x+4y-xy)(4x+3y+1)的每一项都表示出来。关于xy项，有3x×3y，4y×4x，-xy×1，所以xy的系数为9+16-1=24，选择B。
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