subtract a number from 2.4

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subtract a number from 2.4
or add the same number to 一又七分之一,you will get the same result "a".then a=__

0.629
哥们太逗了吧
数学题阿?
给你解出来吧
设：此数字为x
已知：
2.4-x=a
x+ 一又七分之一=a
好我不喜欢分数所以一又七分之一=1.142
那么
x+1.1428=a
x=a-1.142
2.4-a-1.142=a
2.4-1.142=2a
1.258=2a
a=0.629
我用最详细的方法给你解出来的

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