L = 2ПR = 2 * 3.14 * 3.5 = 21.98
S = ПR^2 = 3.14 * 3.5 *3.5 = 38.465
3 5/9 х 1 11/16 = 32/9 х 27/16= 6
<span>2/3</span> × <span>9/10</span> = <span>2·93·10</span> = <span>1830</span> = <span>3·65·6</span> = <span>3/5</span><span> = 0.6
</span>
2 <span>3/5</span> × 1 <span>9/26</span> = 3 <span>1/2</span><span> = 3.5
</span>
1) 15:5=3 (км) - 1 часть
2) 3*3= 9 (км) - по лесу
104*7/13=56
56:4/9=56*9/4=126