<span>74,62-58,025+(-34,31)-(-56,78)-(+39,065)=0</span>
<span>74,62-58,025=16.595</span>
<span>16.595-34.31=-17.715</span>
<span>-17.715+56.78=39.065</span>
<span>39.065-39.065=0</span>
Cos^2-sin 15=cos 30 корень(3)/2
1) НОК=(14,18)=1*2*7*14*3*6*9*18=571536
14=1,2,7,14
18=1,2,3,6,9,18