2/3×5=10/3=3 1/3
3 1/3÷1/3=10/3×3/1=10
число 10
С + 6547 х 3 = 20565
с + 19641 = 20565
с = 20565 - 19641
с = 924
520 - х = 18147 : 263
520 - х = 69
х = 520 - 69
х = 451
((2,37+3,03):0,03+13 1/5 : 2/11-(57,9+13/20)):0,5=
(5,4:0,03+66/5 : 2/11-(57,9+0,65)):0,5=
(18+66/5 * 11/2-(58,55)):0,5= (18+33/5 * 11/1-(58,55)):0,5=
<span>(18+363/5-58,55):0,5=(18+72,6-58,55):0,5=32,05:0,5=64,1
(34,17:1,7+3 3/4+0,25):4/5-12 3/16=
<span>(20,1+3,75+0,25):4/5-12 3/16=24,1*5/4-12,1875=30,125-12,1875=17,25</span></span>