{4x+8(x+y)=480 {4y+9(x+y)=480
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/07/15 20:41:23
{4x+8(x+y)=480 {4y+9(x+y)=480
不要复制黏贴的
不要复制黏贴的
![{4x+8(x+y)=480 {4y+9(x+y)=480](/uploads/image/z/19586924-44-4.jpg?t=%7B4x%2B8%28x%2By%29%3D480+%7B4y%2B9%28x%2By%29%3D480)
4x+8(x+y)=4x+8x+8y=12x+8y=480, 即y=60-1.5x
4y+9(x+y)=4y+9x+9y=13y+9x=480
把y=60-1.5x代入上式得13(60-1.5x)+9x=480,解得x=200/7 y=120/7
4y+9(x+y)=4y+9x+9y=13y+9x=480
把y=60-1.5x代入上式得13(60-1.5x)+9x=480,解得x=200/7 y=120/7
9y=3x-(x-1),4(x+y)-(2x+4)=8y
{4/(x+y)+6/(x-y)=3 {9/(x-y)-1/(x+y)=1
已知4x=9y求(1)x+y/y (2)y-x/2x
[(x+2y)(x-2y)-(x-2y)^2+8y(x+y)]除以4x=
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuai
已知X.x+y.y-4x+2y+5=0,求4X.X-12X Y+9Y.y的值
已知x的平方+y的平方-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知x²+y²-8x+6y+25=0,求(x-y+4xy/x-y)(x+y-4xy/x+y)
已知实数x.y满足根号(x+y-8)+根号(8-x-y)=根号(3x-y-4)+根号(x-2y+7),求x,y
3x+2=y 5X+4=Y 7X+6=Y 9X+8=y 11x=y要如何计算
3x+2=y 5x+4=y 7x+6=y 9x+8=y 11x=y
y-3x=2,y-5x=4,y-7x=6,y-9x=8,y-11x=0方程组,