1.
1) 5/8 + 11/36=20/36 + 11/36 = 31/36
2) 31/36 * 6/67 = 31/402
2.
1) 3/8 * 5 = 15/8
2) 4 1/6 * 2 1/10 = 25/6 * 21/10 = 105/12
3) 9/20 * 6 = 54/20 = 2,7
4) 15/8 + 105/12 = 60/36 + 315/36 = 375/36
5) 375/36 - 27/10 = 1875/180 - 486/180 = 1389/180 = 7 43/60
X-145=12624/526
x-145=24
x=24+145
x=169
1) 60:4 •3 =45 (мин)
2) 40 • 45 + (40+5) • 45 = 3825 (б.) - за 45 мин
3) 5780 ÷ (40+45) = 68 ( мин )
<span>Длина
образующей - 8 см</span>
<span>радиус
цилиндра – 4 см</span>