已知x-y=5,xy=3,则3xy-7x+7x=____________a 抱歉已知x-y=5,xy=3,则3xy-7x+7y=____________

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已知x-y=5,xy=3,则3xy-7x+7x=____________a 抱歉已知x-y=5,xy=3,则3xy-7x+7y=____________
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已知x-y=5,xy=3,则3xy-7x+7x=____________a 抱歉已知x-y=5,xy=3,则3xy-7x+7y=____________
已知x-y=5,xy=3,则3xy-7x+7x=____________
a 抱歉
已知x-y=5,xy=3,则3xy-7x+7y=____________

已知x-y=5,xy=3,则3xy-7x+7x=____________a 抱歉已知x-y=5,xy=3,则3xy-7x+7y=____________
9
是不是题目写错了?

楼主,题错了吧,-7x+7x怎么回事

3xy-7x+7x=3xy=3*3=9

9 题目绝对错了

3xy-7(x-y)=9-35=-26