-3,25: (-5 ц1/5 ) + 6,75 * (47/60 - 2 ц 17/45 ) - (-1,65)) =1
1) 47/60 - 2 ц 17/45 =47/60-107/45=282/360 - 856/360=-574/360
2) -574/360-(-1,65)= -1 ц 214/360+ 1 ц13/20 =-1ц 214 /360+1ц 234/360=20/360=1/18
3)6,75 * 1/18=27/4*1/18=3/8=0,375
4)-3,25: (-5 ц 1/5 )=-3,25 :(-5,2)=0,625
5)0,625 +0,375=1