
已知/X-Y-1/+(XY+3)的平方=0,求(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)的值!!!
已知/X-Y-1/+(XY+3)的平方=0,求(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)的值急急急!!...
已知/X-Y-1/+(XY+3)的平方=0,求(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)的值
急急急!! 展开
急急急!! 展开
1个回答
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/X-Y-1/+(XY+3)的平方=0
X-Y-1=0 XY+3=0
X-Y=1 XY=-3
(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)
=-2XY+2X+3Y-3XY-2Y+2X-X-4Y-XY
=-2XY-3XY-XY+2X+2X-X+3Y-2Y-4Y
=-6XY+3X-3Y
=-6×(-3)+3
=18+3
=21
X-Y-1=0 XY+3=0
X-Y=1 XY=-3
(-2XY+2X+3Y)-(3XY+2Y-2X)-(X+4Y+XY)
=-2XY+2X+3Y-3XY-2Y+2X-X-4Y-XY
=-2XY-3XY-XY+2X+2X-X+3Y-2Y-4Y
=-6XY+3X-3Y
=-6×(-3)+3
=18+3
=21
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