x-50%x=30 y-50%y=x-10
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{6/x+y+10/x-y=30 6/x+y-10/x-y=-1
2Y:30%=3X:50%求X:Y
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
50X+30Y=55000 30X+50Y=65000 求 X Y
化简 x / y(x+y) - y / x(x+y) =
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
x+x=y+30
x>=1,x-y
y=x-1(x
y'-(1/x)y=xe^-x
y=x(x
解二元一次方程(1)2x+y=10,x+2y=8.(2)x+y=18,30%x+70%y=18×50(3)x+y=460,43x=44y=20000
已知:x(x-50y)+xy=50y^2,求:(x-y):y=?
y'/y=1/x
求 X Y公式X+Y=50Y/X=3X+Y=100Y/X=3求 x y...公式
求导 y=[x/(1+x)]^x
已知x+y=a,2x-y=-2a,求[(x/y-y/x)/(x+y)-x(1/x-1/y)]/[(x+1)/y]的值
x.y都是自然数,且x(x-u)-y(y-x)+12,求x.y得值快1且x(x-y)-y(y-x)=12