5/9+13/27 , 3/8+5/24, 5/12-13/72, 3/5-1/7, 5/12+1/60, 9/17-19/68 , 9/10+4/15 4/15-11/60
139
412
Ответы на вопрос:
1)5/9+13/27 = 5/9 × 3 +13/27 = 15/27 + 13/27 = 22/27 2)3/8+5/24=3/8×3+5/24=9/24+5/24=14/24: 2=7/12 3)5/12×6-13/72=30/72-13/72=17/72 4)3/5×7+1/7×5=21/35-5/35=16/35 5)5/12×5+11/60=25/60+11/60=36/60: 6=6/10: 2=3/5 6)9/17×4+19/68=36/68+19/68=55/68 7)9/10×3+4/15×2=27/30+8/30=35/30 8)4/15×4-11/60=16/60-11/60=5/60: 5=1/12
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