y=2340/x+13/18x,x∈[50,100].x取何值时y最小?y=2340/x+(13/18)*x
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y=2340/x+13/18x,x∈[50,100].x取何值时y最小?y=2340/x+(13/18)*x
y=2340/x+13/18x,x∈[50,100].x取何值时y最小?
y=2340/x+(13/18)*x
y=2340/x+13/18x,x∈[50,100].x取何值时y最小?y=2340/x+(13/18)*x
如果y=2340/x+(13/18)*x,则x=18√10;如果y=2340/x+13/(18x),则x=100
X在范围内越大,Y值越小,也就是100
y=2340/x+13/18x,x∈[50,100].x取何值时y最小?y=2340/x+(13/18)*x
用递归法求y=x-(x*x*x/3!)+(x*x*x*x*x/5!)-(x*x*x*x*x*x*x/7!)+.
y=|-x.x+4x+5|
y-x=x-5
(x+y-5)*(x+y-5)+(x-y+3)=0 x*x-y*y
已知:3x-5y=0,求x/y,x-y/y,x-y/x
x+x+x+x+y=40 x+y= 13x=y=
x+y=5; x^y+y^x=17
(x+2y)(x-2y)-(2x-y)的平方+(3x-y)(2x-5y)其中x=-1 y=13分之1
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
若(X×X+Y×Y)(X×X+Y×Y-5)=36,则X×X+Y×Y=
y=x(x
(X-Y)(X+Y)=5 能解么
5x-4y(y-x)=?
x-y+5x-4x= ?x-y+5x-4x= ?
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
x:18=y:13 x-y=50,
化简 x / y(x+y) - y / x(x+y) =