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Which of the following is the coefficient of xy in(3x+4y-xy)(4x+3y+1)?A、9B、24C
Which of the following is the coefficient of xy in(3x+4y-xy)(4x+3y+1)?A、9B、24C
游客
2025-02-23
9
管理
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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