代数方程,(1)2x-1/x-3x/2x-1=2(2)2/x+y-1/x-y=7,1/x+y+1/x-y=-1(3)16/x-3+30/y+5=9,2/x-3+9/y+5=2
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![代数方程,(1)2x-1/x-3x/2x-1=2(2)2/x+y-1/x-y=7,1/x+y+1/x-y=-1(3)16/x-3+30/y+5=9,2/x-3+9/y+5=2](/uploads/image/z/11972256-24-6.jpg?t=%E4%BB%A3%E6%95%B0%E6%96%B9%E7%A8%8B%2C%EF%BC%881%EF%BC%892x-1%2Fx-3x%2F2x-1%3D2%282%292%2Fx%2By-1%2Fx-y%3D7%2C1%2Fx%2By%2B1%2Fx-y%3D-1%283%2916%2Fx-3%2B30%2Fy%2B5%3D9%2C2%2Fx-3%2B9%2Fy%2B5%3D2)
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代数方程,(1)2x-1/x-3x/2x-1=2(2)2/x+y-1/x-y=7,1/x+y+1/x-y=-1(3)16/x-3+30/y+5=9,2/x-3+9/y+5=2
代数方程,
(1)2x-1/x-3x/2x-1=2(2)2/x+y-1/x-y=7,1/x+y+1/x-y=-1(3)16/x-3+30/y+5=9,2/x-3+9/y+5=2
代数方程,(1)2x-1/x-3x/2x-1=2(2)2/x+y-1/x-y=7,1/x+y+1/x-y=-1(3)16/x-3+30/y+5=9,2/x-3+9/y+5=2
兄弟.根据我的经验来个主观推测,题应该有很多括号没加吧?
(1)(2x-1)/x-3x/(2x-1)=2.
(2x-1)²-3x²=2x(2x-1)
4x²-4x+1-3x²=4x²-2x.
3x²+2x-1=0
(3x-1)(x+1).
∴x1=1/3,x2=-1.
(2)2/(x+y)-1/(x-y)=7.----①
1/(x+y)-1/(x-y)=-1.----②
①-②得,1/(x+y)=8.
∴x+y=1/8.-------③
①-2*②得,1/(x-y)=9.
∴x-y=1/9.-----④
③+④得,2x=17/72.
∴x=17/144.
③-④得,2/y=1/72.
∴y=1/144.
(3)16/(x-3)+30/(y+5)=9,-----①
2/(x-3)+9/(y+5)=2.-------②
3*①-10*②得,28/(x-3)=7.
x-3=28/7=4.
∴x=7.
8*②-①得,42/(y+5)=7.
y+5=42/7=6
∴y=1.
兄弟啊..手都给我打酸了..不给最佳就不够意思啦...
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