若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?

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若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?-5X-5Y+3XY=-5

若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?
若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?

若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?
-5X-5Y+3XY
=-5(x+y)+3xy
∵X+Y=3,XY=1
∴原式=-15+3
=-12

-12

(-5)X(X+Y)+3XY=-12
完毕，希望能帮到你，望采纳

-5X-5Y+3XY=-5（x+y）+3xy=-5*3+3*1=-12

x+y=3，xy=1，－5x－5y+3xy。等于－5（x+y）+3xy。已知x+y=3,xy
=1.代入。则原式=－5×3+3×1=－15+3=－12

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