1. а)S= 1.44п см. б) С=2,2* 3,14= 6,908 рад.
4.R=1/2 * 6= 3 см, S=9* 3,14= 28,26 см
<span>11/18</span> - <span>7/12</span> = <span>11·2/18·2</span> - <span>7·3/12·3</span> = <span>22/36</span> - <span>21/36</span> = <span>22/ - 21/36</span> = <span>1/<span>36</span></span>
896+907=1803
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