Пошаговое объяснение:
4 2/5:( 1 - 2/5)+(3/4+5/6): 4 3/4=7 2/3
1) 1-2/5 = 5/5 - 2/5= 3/5
2) 4 2/5 : 3/5 = 22/5 :3/5 = 22/5 *5/3=22/3
3) 3/4+5/6= (3*3)/12+(5*2)/12=9/12+10/12=19/12
4) 19/12 : 4 3/4= 19/12 *4/19=4/12=1/3
5) 22/3 + 1/3= 23/3= 7 2/3
( 3 7/12 - 2 13/24)* 4/5+ ( 4 1/18 - 3 7/12)*6/17=1
1) 3 7/12 - 2 13/24= 3 (2*7)/24 - 2 13/24= 3 14/24 - 2 13/24= 1 1/24
2) 1 1/24 * 4/5 =25/24 * 4/5= 5/6
3) 4 1/18 - 3 7/12=4 2/36 - 3 (7*3)/36= 4 2/36- 3 21/36=
3 38/36- 3 21/36=17/36
4) 17/36 * 6\17=1/6
5) 5/6 +1/6=6/6=1
