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9/28+1/21=27/84+4/84=31/84
5 3/4 - 5/12=23/4-5/12=69/12-5/12=64/12=5 1/3
5 1/8 + 6 2/3=41/8+20/3=123/24+160/24=283/24=11 19/24
7 5/6-2 7/8=47/6-23/8=168/24-69/24=99/24=4 1/8
17/72+3 7/9=17/72 + 34/9= 17/72 + 272/72= 289/72= 4 1/72
3 2/25 x 8 4/7= 77/25 x 60/7 = 11/5 x 12 = 132/5 = 26 2/5
7 5/6 + 2 3/4= 47/6 + 11/4= 94/12 + 33/12= 127/12=10 7/12
7/15 x 35/18 + 49/12 = 7/3 x 7/18 + 49/12 = 49/54 + 49/12= 294/324 + 1323/324= 1617/324= 4 321/324
8 4/9 + 3 5/18 + 2 2/27= 76/9 + 59/18 + 56/27= 456/54 + 177/54 + 112/54= 745/54= 13 43/54
reszta w zalaczniku