若x+y=3,xy=2,则(5x+2)-(3xy-5y)=( )
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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
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