Объем куба равен 27см там сверху три.Найдитеплошадь грани куба​

1. 2х7 = 14 х 50 = 700 х 9 = 6 300

 

2.    6200            3. 25 х 72 = 1800 х 4 = 7200 х 40 = 288 000        4.   1645

    + 1730                                                                                               +2316

                                                                                               

       7930                                                                                                 3961

    +   800                                                                                               +1355

                                                                                              

       8730                                                                                                  5316

     +  170                                                                                               +   684

                                                                                               

       8900                                                                                                  6000

1) 20/25 :5 = 4/5
36/72 :36 =1/2
105/30 :5 = 21/6 = 3 3/6 :3 = 3 1/2
2)а)8/5 и 7/12
8/5 = 96/60 = 1 36/60
7/12= 35/60
8/5>7/12
б)11/303 и 7/202
11/303=22 /606
7/202= 21/606
11/303>7/202
3)а)3/4-1/6=9/12 - 2/12 =7/12
3/4= 9/12
1/6= 2/12
б)11/12+9/10=55/60+54/60=109/60=1 49/60
11/12=55 /60
9/10=54 /60
в)5/6 +3/8 - 1/3=20/24 +9/24 - 8/24=21/24=7/8
5/6= 20/24
3/8= 9/24
1/3= 8/24
4)4/15= 16/60
1/12= 5/60
1)16/60 - 5/60 = 11/60(км подводная лодка во второй день.
2)16/60 +11/60 = 27/60 или 9/20(км)
ответ:27/60 или подводная лодка за два дня.
5)8/11= 24/33
7/11= 21/33
24/33>23/33;22/33>21/33