已知x+y=2,xy=-5则x分之y+y分之x等于

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已知x+y=2,xy=-5则x分之y+y分之x等于
已知x+y=2,xy=-5则x分之y+y分之x等于

已知x+y=2,xy=-5则x分之y+y分之x等于
x分之y+y分之x
=(x²+y²)/xy
=(x²+2xy+y²-2xy)/xy
=(x+y)²/xy-2
=(2)²/(-5)-2
=-4/5-2
=-2.8

y/x+x/y=(x+y)/(xy)=-2/5

x+y=2
xy=-5
y/x+x/y
=y²/(xy)+x²/(xy)
=(x²+y²)/(xy)
=[(x+y)²-2xy]/(xy)
=[4-2*(-5)]/(-5)
=(4+10)/(-5)
=-14/5

y/x+x/y
=(x²+y²)/xy
=[(x+y)²-2xy]/xy
=(2²+10)/(-5)
=-14/5

负5分之14

x/y+y/x=(x2+y2)/xy=[(x+y)2-2xy]/xy=(2*2+2*5)/-5=-14/5

等于负的五分之十四

(y/x)+(x/y)
=(x²+y²)/(xy)
=[(x+y)²-2xy]/(xy)
=(4+10)/(-5)
=-14/5

x分之y+y分之x
=((x^2+y^2)/xy
=[(x+y)^2-2xy]/xy
=(4+10)/(-5)
=-14/5

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