А) 2/7:8+5:0,7-3/4:21

1)8:4=2 (кг.)-объём банки 2)40:2=20 (б.)- понадобится. Ответ: 20 банок

                                  Входной контроль.1 страница.
                                             №1
а)0
                                             №2
а)1
                                             №3

394,395,396,397,398,399,400,401,402,403,404,405,406,407,408.
                                             №4
258=200+50+8
904=900+4
360=300+60
799=700+90+9
                                             №5
589-592                199-202              440-443
600-603                 997-1000            209-212 
                                             №6
1)357,645,654,729,928,935,953.
                                             №7
630
---------
                                             №8

3)917-269 меньше чем 917-268
                                             

165/15=11кг апельсинов
375/15=25кг яблок

750-100%
855-x%
x-?
x=855x100/750=114%
Ответ:114%