x+2y+3z=28 x:y:z=1:2:3 解方程
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x+2y+3z=28 x:y:z=1:2:3 解方程
x+2y+3z=28 x:y:z=1:2:3 解方程
x+2y+3z=28 x:y:z=1:2:3 解方程
x:y:z=1:2:3
y=2x
z=3x
x+2y+3z=x+4x+9x=14x=28
x=2
y=2x=4
z=3x=6
x=2 y=4 z=6
由x:y:z=1:2:3 知:x/1=y/2=z/3=k
这样x=k,y=2k,z=3k,代入x+2y+3z=28 中,解出K=2
那么x=2,y=4,z=6
3x=2y=z , 1/3 z+z3z=28 z=84/13,y=42/13 ,x=28/13
设x=1k. y=2k z=3k
代入x+2y+3z=28
1k+4k+9k=28
14k=28
k=2
x=1x2=2 y=2x2=4 z=3x2=6
设x=a, 则y=2a, z=3a,依次套入 x+2y+3z=28 此方程中,即为
a+2*2a+3*3a=28
a+4a+9a=28
14a=28
a=2
所以,x=2, y=4, z=6
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X+2y+3Z=28 x:y:z=1:2:3