计算:(1)(√xy+2√y/x+√x/y+√1/xy)√xy (2)(√5-√3)^2-(√5+√3)^2(3)当x=√3-1时,求x^2+3x-4的值
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计算:(1)(√xy+2√y/x+√x/y+√1/xy)√xy (2)(√5-√3)^2-(√5+√3)^2(3)当x=√3-1时,求x^2+3x-4的值
计算:(1)(√xy+2√y/x+√x/y+√1/xy)√xy (2)(√5-√3)^2-(√5+√3)^2
(3)当x=√3-1时,求x^2+3x-4的值
计算:(1)(√xy+2√y/x+√x/y+√1/xy)√xy (2)(√5-√3)^2-(√5+√3)^2(3)当x=√3-1时,求x^2+3x-4的值
x=0,y=1
集合A'B={1,-1,0}
方法很简单!把情况都写一遍,有的舍,有的要!
当x-y=0时 x=y
x+y=x^2+y^2 and xy=x^2-y^2 此时x=0 y=0
or
xy=x^2+y^2 and x+y=x^2-y^2 此时x=0 y=0
当x+y=0时 x=-y
x-y=x^2+y^2 and xy=x^2-y^2 此时x=0 y=0
or
xy=x^2+y^2 and x-y=x^2-y^2 此时x=0 y=0
当xy=0时 x=0 或y=0
x+y=x^2+y^2 and x-y=x^2-y^2 x+y=0
or
x-y=x^2+y^2 and x+y=x^2-y^2 x-y=0
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