900x+1200y+1100(60-x-y)= 61000
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![900x+1200y+1100(60-x-y)= 61000](/uploads/image/z/5183996-68-6.jpg?t=900x%2B1200y%2B1100%EF%BC%8860-x-y%EF%BC%89%3D+61000)
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900x+1200y+1100(60-x-y)= 61000
900x+1200y+1100(60-x-y)= 61000
900x+1200y+1100(60-x-y)= 61000
这个方程有两个未知数,所以不存在唯一解.要确定的解,需要补充条件.
900x+1200y+66000-1100x-1100y=61000
-200x+100y+66000=61000
2x-y=50
以下需要补充条件来定解
双函数仅有一个等式,只能象一楼的解了
计算题求过程[答者必赞]900x+1200x+1100(60-x-y)-61000-1500
900x+1200y+1100(60-x-y)= 61000
x+y=7 900x=1200y ,
900x=1200y x+y=7
x+y=7 900x=1200y 嗷
x+x+x+y=60 .x-y=4
{(x,y) |x|+|y|
x>y?x:y
{x/60+y/80=10,x/60+y/40=15、{2x/3+3y/4=1/5,5x/6-5y/2=2、{5/2(x+y)=1200,10/3(x+y)=1200{4x+5y=98,5y-4x=2、{x/3+y/4=54/60,y/4+x/5=42/60怎么解?{40-y=x-4 40-y=y-x
x^/y-x-y^/y-x化简.
化简x(y-x)-y(x-y)
行列式计算 x y x+y y x+y x x+y x y|x y x+y ||y x+y x ||x+y x y |
y/(x+y)-x/(x-y)
因式分解x(x+y)(x-y)-x(x+y)^2
x(x+y)(x-y)-x(x+y)的平方
x(x+y)(x-y)-x(x+y)² 因式分解
x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2
3.2x+60+x=y