Решить примеры: 19/42-5/63 (7/10+3//6+2/3) 2/3-(1/20+2/9)-5/18 - вопрос №208143919425637103623231202951813141516 от nnn0212 07.07.2022 11:36

Question

Математика: Решить примеры: 19/42-5/63 (7/10+3//6+2/3) 2/3-(1/20+2/9)-5/18 1/3+1/4+1/5+1/6+1/7

nnn0212 · Answer

19/42-5/63=(57-10)126=47/126(7/10+3/5)-(1/6+2/3)=7/157/10+3/5=(7+6)/10=13/101/6+2/3=(1+4)/6=5/613/10-5/6=(39-25)/30=14/30=7/152/3-(1/20+2/9)-5/18=7/601/20+2/9=(9+40)/180=49/1802/3-49/180=(120-49)/180=71/18071/180-5/18=(71-50)/180=21/180=7/601/3+1/4+1/5+1/6+1/7=(140+105+84+70+60)/420=459/420=1 39/420...