Ответы на вопрос:
1/4 +3/5 =5/20+12/20=17/20 9/11 -2/5 =45/55 -22/55=12/55 13/16 - 9/32 = 26/32 -9/32=17/32 3/28 + 5/14 = 3/28 +10/28=13/28 14/15 -7/10= 28/30 -21/30=7/30 3/8 +1/6 = 18/48 + 8/48 = 24/48=1/2
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