15/(X+Y)=0.5 15/(X-Y)=3能得出x+y=30 x-y=5?

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15/(X+Y)=0.515/(X-Y)=3能得出x+y=30x-y=5?15/(X+Y)=0.515/(X-Y)=3能得出x+y=30x-y=5?15/(X+Y)=0.515/(X-Y)=3能得出x

15/(X+Y)=0.5 15/(X-Y)=3能得出x+y=30 x-y=5?
15/(X+Y)=0.5 15/(X-Y)=3
能得出x+y=30 x-y=5?

15/(X+Y)=0.5 15/(X-Y)=3能得出x+y=30 x-y=5?
15/(x+y)=0.5可以变成15/0.5=x+y
这样理解了吧

15/(x+y)=0.5可以变成15/0.5=x+y
这样理解了吧

15/(X+Y)=0.5 15/(X-Y)=3
(X+Y)=15/0.5=30 (X-Y)=15/3
(X+Y)=30 (X-Y)=5
[15/...

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15/(X+Y)=0.5 15/(X-Y)=3
(X+Y)=15/0.5=30 (X-Y)=15/3
(X+Y)=30 (X-Y)=5
[15/(X+Y)=0.5 15除以 (X+Y)等于0.5 也就是15除以0.5等于(X+Y),所以(X+Y)等于15除以0.5等于30了,得出的 (X+Y)=30
15/(X-Y)=3 15除以 (X-Y)等于3也就是15除以3等于(X-Y),所以(X-Y)等于15除以3等于5了,得出的 (X-Y)=5]
X+Y=30
X-Y=5
2X=35(两个方程式相加得出来的结果)
X=17.5
Y=12.5

收起

将这两个方程左右两边同时取倒数,(X+Y)/15=2
(X-Y)/15=1/3
在去分母得X+Y=30
X-Y=5