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