若x+y=3,xy=2,则(-5x+2)-(3xy+5y)的值为
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若x+y=3,xy=2,则(-5x+2)-(3xy+5y)的值为
若x+y=3,xy=2,则(-5x+2)-(3xy+5y)的值为
若x+y=3,xy=2,则(-5x+2)-(3xy+5y)的值为
(-5x+2)-(3xy+5y)
=-5x+2-3xy-5y
=-5(x+y)-3xy+2
因为x+y=3,xy=2
原式=-5*3-3*2+2=-15-6+2=-19
(-5x+2)-(3xy+5y)= -5(x+y)-3xy+2=-5×3-3×2+2=-19
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