1 )2 целых 49/72*15-25 целых 7/12= 2)5 целых 11/20*8+6 целых 3/10= решите хоть 1. Created by irinakruchi. matematika-ru

10= решите хоть 1...

irinakruchi @irinakruchi

August 2022 1 27 Report

1 )2 целых 49/72*15-25 целых 7/12=
2)5 целых 11/20*8+6 целых 3/10=
решите хоть 1

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TigerYa

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1 )2 целых 49/72*15-25 целых 7/12=

(2•72+49)/72 • 15- 25 7/12=

193/72• 15- 307/12=
{72 и 15 сокращаем на 3} ;
193/24• 5- 25 7/12=
965/24 - 25 7/12= 40 5/24- 25 7/12= 39 (24•1+5)/24 - 25 (7•2)/(12•2)= 39 29/24- 25 14/24= 19 15/24= 19 3/8;

2)5 целых 11/20*8+6 целых 3/10=
(5•20+11)/20 • 8+ 6 3/10=
111/20• 8+ 6,3=
{сокращаем 20 и 8 на 4};
111/5• 2+ 6,3= 222/5+ 6,3=
44 2/5+ 6,3= 44 (2•2)/(5•2) + 6,3=
44 4/10+ 6,3= 44,4+ 6,3= 50,7

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