7/10 и 31/45 НОК(10;45)=НОК(2,5; 3,3,5)=2*3*3*5=90. 7/10=63/90; 31/45=70/90; 31/45>7/10.
<span>(х+12):86=11,
х+12:86=11,
х+12=946,
х=946-12,
х=934.
Ответ: 934.</span>
1 ч = 60 мин.
60 * 1/10 = 60/10 = 60 : 10 = 6 мин.
60 * 1/4 = 60/4 = 60 : 4 = 15 мин.
60 * 1/3 = 60/3 = 60 : 3 = 20 мин.
60 * 2/5 = 120/5 = 24 мин.
60 * 3/4 = 180/4 = 180 : 4 = 45 мин.
1:1/8+1/12=8+1/12=97/12=8.08