1/2+2/5,1/2-2/5,1/4+1/6,9/10-5/6
3/4+2/3,3/5-1/3,3/4-2/3,2/4+3/14
1/4-1/6,3/5+1/3,4/5+3/4,7/10-1/4
только не сразу ответ а решением ну вот так:
1/2+2/3=1*3+2*3 = 3/6+4/6=7/6

             2*3  3*2


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