1.02*(X+Y)=76500.98X+1.1Y=7650
来源:学生作业帮助网 编辑:作业帮 时间:2024/10/23 13:41:59
1.02*(X+Y)=76500.98X+1.1Y=7650
1.02*(X+Y)=7650
0.98X+1.1Y=7650
1.02*(X+Y)=76500.98X+1.1Y=7650
两式相加得
1.02x+1.02y+0.98x+1.1y=15300
即:2x+2.12y=15300①
两式相减得
1.02x+1.02y-0.98x-1.1y=0
即:0.04x-0.08y=0再得
4x-8y=0
x=2y②
由①和②得
6.12y=15300
y=2500
x=5000
恩 ,这都行,建议大家不要为了分数回答此类问题。
现在学生真厉害
有点可怕……
X[X/(Y+X)+X/(X-Y)]=120/288 求X/Y
1.02*(X+Y)=76500.98X+1.1Y=7650
x+x+x+y+y=54,x+x+y+y=46在这种情况下,x=(?)y=(?)
y(x+y)+(x-y)²-(x+y)(x-y),其中x=-1/3,y=3
X+Y/X=2,X/Y=?是(x+y)/x=2哦
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
(x+y)/2- x-y/2=6 3(x+y)=4(x-y)
x²+y²=108(x-y),x,y为正整数,求x,y.
f(x+y,y/x)=x²-y².求f(x,y)
x(x-2y)=y(2y-x) ,则y分之x是多少
化简 x / y(x+y) - y / x(x+y) =
y=x(x
x(x+y)(x-y)-y(y+x)(y-x)=(x-y)( )填空
先化简,再求值 [2/3x - 2/x+y(x+y/3x -x-y)]*x/x-y,其中5x+3y=0
y'=(y/x)^2+y/x+4微分方程
[x/(x-y)]·[y²/(x+y)]-[x^4y/(x^4-y^4)]÷[x²/(x²+y²)]=
分式的加减:[(x/y-y/x)除以(x+y)+x(1/y-1/x)]除以1+x/y,其中x=5,y=2
求函数f(x,y)=x×x×x-y×y×y+3×x×x+3×y×y-9x的极值