若x+y=3,xy=2,则(5x+2)-(3xy-5y)=( )

来源:学生作业帮助网 编辑:六六作业网 时间:2024/10/02 19:22:54
若x+y=3,xy=2,则(5x+2)-(3xy-5y)=()若x+y=3,xy=2,则(5x+2)-(3xy-5y)=()若x+y=3,xy=2,则(5x+2)-(3xy-5y)=()(5x+2)-

若x+y=3,xy=2,则(5x+2)-(3xy-5y)=( )
若x+y=3,xy=2,则(5x+2)-(3xy-5y)=( )

若x+y=3,xy=2,则(5x+2)-(3xy-5y)=( )
(5x+2)-(3xy-5y)=5x+5y-3xy+2=5(x+y)-3xy+2=5×3-3×2+2=15-6+2=11

(5x+2)-(3xy-5y)
=5x+5y-3xy+2
=5*3-3*2+2
=11