设10x=3,10y=4 1、10x+2y=?
设十位为x,个位数字为 y,列方程组 x+y=6,10x+y+18=10y+x x=2,y=4
设x,y,满足约束条件x+y-2≥3,x-y≥-1,2x-y≤3,若目标函数z=a/x+b/y的最大值为10,则5a+4
设x.y都是有理数,并且x,y满足x的平方-2y+√5y=10+3√5 x+y的值
设x>-1,求函数y=(x^2+7x+10)/(x+1)的最值,又设x
高数 设函数y=2x^10+3x^6,则y^(10)=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知2x-y=10,求[(x²+y²)-(x-y)²+2y(x-y)]/4y
设实数X,Y满足2X+Y-2>=0,X-2Y+4>=0,3X-Y
设x-y+1=0,求d=√x^2+y^2+6x-10y+34+√x^2+y^2-4x-30y+229的最小值
设实数x,y满足方程:x^+y^-8x-6y+21=0,求:(1)2x-y的取值范围 (2)x^+y^-10x+2y+2
已知X,Y,满足(X+3Y)(X-3Y)=-10(Y^2-6/5)和2X(Y-1)+4(1/2X-1)=0
解方程组:(0.2x+0.1y)/2- (4x-y)/10=(x-y)/5+ (3x+0.5y)/30 (3x+2y-1