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1)=> 24/7 + 21/4 + 7/3
=> 24*12 + 21*21 + 7*28 / 84
=> 288 + 441 + 196 / 84
=> 925 / 84
2)=>8/26 , 7/13 , 12/51
=> 4/13 , 7/13 , 4/17
=> 4*17/221 , 7*17/221 , 4*13/ 221
=> 68/221 , 119/221 , 52/221
3)=> 7/4 / 7/12
=> 7/4 * 12/7
=> 12/4
=> 3
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