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150=20=170 150-20=130 150*20=3000 150:20=7,5
20+12 1/2=32 1/2 20-12 1/7 1/2 20*12 1/2=250 20:12 1/2=1 11/15
13 1/3+12=25 1/3 13 1/3-12=1 1/3 13 1/3*12=160 13 1/3:12=1 2/8
14 2/3+2 1/2=17 1/6 14 2/3-2 1/2=12 1/6 14 2/3*2 1/2=35 2/6 14 2/3:2 12=5 11/15