1]х+300=600:2
х+300=300
х=300-300
х=0
------------------------------------------
2*[300+0]=600
600=600
2]800:у=500+300
800:у=800
у=800-800
у=0
-------------------------------
3]а+200=400*2
а+200=800
а=800-200
а=600
-------------------------------
4]а=92-81
а=11
--------------------------------
(8+3)-(8-3)=6
(13+3)-(13-3)=6
Ответ: на 6, на 6
1) 13/4 = 3¼ ;
2) 19/7 = 2. 5/7 ;
3) 35/9=3. 8/9 ;
4)68/11 = 6. ²/11 ;
5) 91/16 = 5¹/16 ;
6) 141/10 = 14¹/10 ;
7) 171/13 = 13²/13 ;
8) 337/16 = 21¹/16 ;
9) 905/31 = 29. 6/31 ;
10) 1000:29 = 34. 14/29