根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12
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根号下[x^2+(y+4)^2]+根号下[x^2+(y-4)^2]=12根号下[x^2+(y+4)^2]+根号下[x^2+(y-4)^2]=12根号下[x^2+(y+4)^2]+根号下[x^2+(y-
根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12
根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12
根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12
根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12
√[x^2+(y+4)^2] + √[x^2+(y-4)^2] = 12
[x^2+(y+4)^2] + 2√[x^2+(y+4)^2][x^2+(y-4)^2] +[x^2+(y-4)^2] = 144
x^2+y^2+8y+16 + 2√[x^2+(y+4)^2][x^2+(y-4)^2] +x^2+y^2-8y+16 = 144
√[x^2+(y+4)^2][x^2+(y-4)^2] =56-x^2-y^2
[x^2+(y+4)^2][x^2+(y-4)^2] =56^2+x^4+y^4-112x^2-112y^2+2x^2y^2
[x^2+(y+4)^2][x^2+(y-4)^2] =56^2+x^4+y^4-112x^2-112y^2+2x^2y^2
x^4+((y+4)^2+(y-4)^2)x^2+(y^2-16)^2=56^2+x^4+y^4-112x^2-112y^2+2x^2y^2
x^4+2x^2y^2+32x^2+y^4-32y^2+16^2=56^2+x^4+y^4-112x^2-112y^2+2x^2y^2
2880-144x^2-80y^2=0
180-9x^2-5y^2=0
(x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.(x+y)/(根号下x+根号下y)+2xy/(x根号下y+y根号下x)=______.
(x*根号下x + x*根号下y ) / (xy-y^2) — （x + 根号下xy + y) /（x*根号下x — y*根号下y）
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一些二次根式已知4X^2+Y^2-4X-6Y+10=0,求(2/3X根号下9X+Y^2根号下X/Y^3)-(X^2根号下1/X-5X根号下Y/X)的值.已知根号下5约等于2.236,求(根号下80-根号下9/5)-(根号下16/5+4/5根号下45)的值.(结果精确到0.01)(1-2根
根号下[x^2+(y+4)^2] + 根号下[x^2+(y-4)^2] = 12
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