(4 2/5+3 1/3):17 =(22/5+10/3):52/3=(66/15+50/15)*3/52=116/15*3/52=
1 22/65
(11 3/10-8 7/9):8 1/4=(113/10-79/9):33/4=(1017/90-790/90):33/4=227/90*4/33=454/1485
360:3*1=120 градусов 360/4*1=90 360:6*1=60 360:12*1=30
2 1/17а+6 2/3d=35/17a+20/3b=35/17*3 2/5+20/3*7/10=35/17*17/5+20/3*7/10=7+14/3=7 14/3
3x+4 3/5=6 1/9
3x=55/9-23/5
3x=275/45-207/45
3x=68/45
x=68/45*1/3
x=68/135
10 3/10-2x=8
-2x=8-10 3/10
-2x=80/10-103/10
-2x=-23/10
x=- 23/10*1/2
x=23/20