解方程组{ 4X+5Y+2Z=40 X;Y;Z=1;2;3
3个回答
X:Y:Z=1:2:3
X/1=Y/2=Z/3
所以Y=2X,Z=3X
代入 4X+5Y+2Z=40
4X+10X+6X=40
20X=40
X=2
Y=2X=4
Z=3X=6
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