{0.6x-0.4y=1.1,
{0.6x-0.4y=1.1,
解方程组0.6x-0.4y=1.10.2x-0.4y=2.3
0.6y-0.4x=30 x+y=450怎么解
画出函数图像y甲=50+0.4x y乙=0.6x
x+y=15 1.15x+1.1y=17
x+y=50 1.5x+1.1y=50
x+y=150 1.5x+1.1y=50
3(x+y)+2(x-y)=20 0.3x+0.6y=60 x=?y=?
0.5x+0.7y=35,x+0.4y=40.求x=?,y=?
二元函数f(x,y)=x+y/x-y,求f(y/x,x/y)
[x(x-y)-y(x-y)+(x+y)(x-y)]÷2x其中x=2012 y=2013
) y=cos(x-y)