作业帮若X+Y=3,XY=1,则-5X-5Y+3XY的值是多扫?
来源：学生作业帮助网 编辑：作业帮 时间：2024/07/28 03:07:19
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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(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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