Выполните действия: 1) (1 3/5+1,8)*1/2; 4) (5,4-2 1/3):7 2/3
(1 3/5+1,8)*½=(1,6+1,2)•½= =2,8•½=1,4 (5,4-2 ⅓):7 ⅔=? 5,4=54/10=27/5 2⅓=7/3 7⅔=23/3 (27/5)-(7/3)=(27•3-7•5)/15=46/15 (46/15) :(23/3)= (46/15)*(3/23)= =(2*23*3)/(5*3*23)=2/5=0,4 (5,4-2 ⅓):7 ⅔=0,4