78*((1/24)-(1/54))+24 *(1/54+1/78)-54*(1/24-1/78)
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![78*((1/24)-(1/54))+24 *(1/54+1/78)-54*(1/24-1/78)](/uploads/image/z/3938978-2-8.jpg?t=78%2A%28%281%2F24%29-%281%2F54%29%29%2B24+%2A%EF%BC%881%2F54%2B1%2F78%EF%BC%89-54%2A%EF%BC%881%2F24-1%2F78%EF%BC%89)
78*((1/24)-(1/54))+24 *(1/54+1/78)-54*(1/24-1/78)
78*((1/24)-(1/54))+24 *(1/54+1/78)-54*(1/24-1/78)
78*((1/24)-(1/54))+24 *(1/54+1/78)-54*(1/24-1/78)
78*(1/24-1/54)+24 *(1/54+1/78)-54*(1/24-1/78)
=78*1/24-78*1/54+24 *1/54+24*1/78-54*1/24+54*1/78
=(78-54)*1/24-(78-24)*1/54+(24+54)*78
=24*1/24-54*1/54+78*1/78
=1-1+1
=1