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23/6 + 2 39/20 47/12 3/4 + 1
35/6 7/4
7/2 + 1/3 + 2 = {(3)(7)+(2)(1)+(6)(2)} / 6= 35/6..................mcm(2;3)=6
3/10 + 5/20 + 7/5 ={(2)(3)+(1)(5)+(4)(7)} / 20=39/20
..............mcm(5;10;20)=20
11/4 + 7/6 ={(3)(11)+(2)(7)} / 12 =47/12 ......................mcm(4;6)=12
5/4 - 1/2 + 1 ={(1)(5)-(2)(1)+(4)(1)} / 4=7/4 ......................mcm(2;4)=4