100/(x-y)+100/(x+y)=100/y 怎么解100/(x-y)+100/(x+y)=100/y 怎么解出 x=(1+根号2)y

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100/(x-y)+100/(x+y)=100/y 怎么解100/(x-y)+100/(x+y)=100/y 怎么解出 x=(1+根号2)y
100/(x-y)+100/(x+y)=100/y 怎么解
100/(x-y)+100/(x+y)=100/y
怎么解出 x=(1+根号2)y

100/(x-y)+100/(x+y)=100/y 怎么解100/(x-y)+100/(x+y)=100/y 怎么解出 x=(1+根号2)y
100/(x-y)+100/(x+y)=100/y
1/(x-y)+1/(x+y)=1/y
通分
(x+y+x-y)/(x+y)(x-y)=1/y
2x/(x+y)(x-y)=1/y
对角相乘
2xy=(x+y)(x-y)=x^2-y^2
x^2-2xy-y^2=0
把y看成已知
则x^2-2xy+y^2=2y^2
(x-y)^2=2y^2=(±√2y)^2
x-y=±√2y
x=y±√2y=(1±√2)y

X+Y=7(100X+Y)-(10Y+X)=(10Y+X)-(10X+Y) 328-y/y x 100％=-18％ If two even number x,y satisfy equation x×x+100=y×y,x 求 X Y公式X+Y=50Y/X=3X+Y=100Y/X=3求 x y...公式 x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 {x-y=100 {12%x-10%y=100 化简 x / y(x+y) - y / x(x+y) = 6X+5y=100 x=?y=? {2x=y x/60+y/100=2.2 ｛x+y=100 0.7x+0.8y=74 X+Y=10009.93%x+25%y=100 x+y=22 2.5x+7y=100 x+y=32,2x+4y=100 x=y*20+100,x=y*25-50] x+y=43 2x+4y=100 X-Y=500 (X-300)/Y*100%=120% x+y=100 2×16x=18y [20y+100=x,25y-50=x]