3м25дм =550 см
550*4=2200 см=22 метра
2800х5%=140
2800-140=2660 х5%= 133
2660-133=2527х5%= 126.35
2527-126.35= 2400.65х5%=120.03
2400.65-120.03=2280.62х5%= 114.03
2280.62-114.03=2166.59х5%= 108.33
2166.59-108.33=2058.26х5%=102.91
2058.26-102.91=1955.35х5%=97.77
1955.35-97.77=1857.58
1.
29/36 + 5/54 = 174/216 + 20/216 = 194/216 = 97/108
0,36 - 9/75 + 2/15 = 36/100 - 9/75 + 2/15 = 108/300 - 36/300 + 40/300 = 112/300 = 28/75
(1/2 - 1/3) - (1/4 - 1/5) = (3/6 - 2/6) - (5/20 - 4/20) = 1/6 - 1/20 = 10/60 - 3/60 = 7/60
2.
a) 3/4 - (x + 1/20)= 1/5
3/4 - x - 1/20 = 1/5
3/4 - x = 4/20 + 1/20
3/4 - x = 5/20
-x = 5/20 - 15/20 = -10/20
x = 1/2
б) 2/3 - (x - 1/21) = 2/7
2/3 - x + 1/21 = 2/7
2/3 - x = 6/21 - 1/21
2/3 - x = 5/21
-x = 5/21 - 14/21 = -9/21 = -3/7
x = 3/7
3100 + 1500 = 4600 г собрала Дина
3100 - 800 = 2300 собрал Андрей
3100 + 4600 + 2300 = 10000 = 10кг собрали дети вместе