5/2(x+y)=1200 10/3(x-y)=1200的解5/2=5分之2 应用题来的 A市到B市的航线长1200KM,一架飞机从A市顺风飞往B市需2小时30分,从B市顺风飞往B市需3小时20分,求飞机的平均速度与风速。本人也不知方程组
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![5/2(x+y)=1200 10/3(x-y)=1200的解5/2=5分之2 应用题来的 A市到B市的航线长1200KM,一架飞机从A市顺风飞往B市需2小时30分,从B市顺风飞往B市需3小时20分,求飞机的平均速度与风速。本人也不知方程组](/uploads/image/z/1628721-9-1.jpg?t=5%2F2%28x%2By%29%3D1200+10%2F3%28x-y%29%3D1200%E7%9A%84%E8%A7%A35%2F2%3D5%E5%88%86%E4%B9%8B2+%E5%BA%94%E7%94%A8%E9%A2%98%E6%9D%A5%E7%9A%84+A%E5%B8%82%E5%88%B0B%E5%B8%82%E7%9A%84%E8%88%AA%E7%BA%BF%E9%95%BF1200KM%EF%BC%8C%E4%B8%80%E6%9E%B6%E9%A3%9E%E6%9C%BA%E4%BB%8EA%E5%B8%82%E9%A1%BA%E9%A3%8E%E9%A3%9E%E5%BE%80B%E5%B8%82%E9%9C%802%E5%B0%8F%E6%97%B630%E5%88%86%EF%BC%8C%E4%BB%8EB%E5%B8%82%E9%A1%BA%E9%A3%8E%E9%A3%9E%E5%BE%80B%E5%B8%82%E9%9C%803%E5%B0%8F%E6%97%B620%E5%88%86%EF%BC%8C%E6%B1%82%E9%A3%9E%E6%9C%BA%E7%9A%84%E5%B9%B3%E5%9D%87%E9%80%9F%E5%BA%A6%E4%B8%8E%E9%A3%8E%E9%80%9F%E3%80%82%E6%9C%AC%E4%BA%BA%E4%B9%9F%E4%B8%8D%E7%9F%A5%E6%96%B9%E7%A8%8B%E7%BB%84)
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5/2(x+y)=1200 10/3(x-y)=1200的解5/2=5分之2 应用题来的 A市到B市的航线长1200KM,一架飞机从A市顺风飞往B市需2小时30分,从B市顺风飞往B市需3小时20分,求飞机的平均速度与风速。本人也不知方程组
5/2(x+y)=1200 10/3(x-y)=1200的解
5/2=5分之2
应用题来的 A市到B市的航线长1200KM,一架飞机从A市顺风飞往B市需2小时30分,从B市顺风飞往B市需3小时20分,求飞机的平均速度与风速。本人也不知方程组列对没··
5/2(x+y)=1200 10/3(x-y)=1200的解5/2=5分之2 应用题来的 A市到B市的航线长1200KM,一架飞机从A市顺风飞往B市需2小时30分,从B市顺风飞往B市需3小时20分,求飞机的平均速度与风速。本人也不知方程组
5/2(x+y)=1200
x+y=1200÷5/2
x+y=3000 (1)
10/3(x-y)=1200
x-y=1200÷10/3
x-y=4000 (2)
(1)+(2)
2x=7000
x=3500
y=3000-x=-500
已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y)
(4x-2y-z)-{5x[8y-2y-(x+y)]-x+(3y-10z)]=? kuaihuajian
x-y/7 - x+y/10 =1/2 2(x-y)-5(x+y)=3修改、、、、(x-y)/7-(x+y)/10=1/2 2(x-y)-5(x+y)=3
5(x+y)-2x=0 3x-10(x+y)=2
{2X=5(X+Y) 3X-10(X+Y)=2
{2X=5(X+Y)3X-10(X+Y)=2怎么解?
{2x=5(x y) 3x-10(x y)=2
3(2X+Y)+(2(2x-Y)=6 (8X+4y)-(10X-5Y)=2
已知x,y满足约束条件 2x+5y>=10 2x-3y>=-6 2x+y
已知x,y满足约束条件{2x+5y>=10,2x-3y>=-6,2x+y
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
{ x-y/7-x+y/10=1/2 {2(x-y)+5(x+y)=3
(4x-2y-z)-{5x-[8y-2z-(x-2y)]-x-(3y-10z)}=?
已知实数x,y满足2x+5y>=10;2x-3y>-6;2x+y
10/x+y+3/x-y=-5 15/x+y-2/x-y=-1(用换元法解此方程组)
解分式方程:10/(x+y)+3/(x-y)=-5,15/(x+y)-2/(x-y)=-1
3/(X-Y)+10/(X+Y)=-5 2/(X-Y)-15/(X+Y)=1 解分式方程组
{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