x+y=6,xy=8,求5x+xy+5y/x-xy+y的值
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x+y=6,xy=8,求5x+xy+5y/x-xy+y的值
x+y=6,xy=8,求5x+xy+5y/x-xy+y的值
x+y=6,xy=8,求5x+xy+5y/x-xy+y的值
5x+xy+5y/x-xy+y
=[5(x+y)+xy]/[(x+y)-xu]
=(5×6+8)/(6-8)
=-19
-19
.
-19
当x=2时,y=4时 值为24
当x=4时,y=2时 值为24.5
-19
(5x+xy+5y)/(x-xy+y)=(5*6+8)/(6-8)=-19
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