25*2-4х*2+8=18
50-8х+8=18
(50-8+18):8=60:8=7.5
1) 12 + 8 = 20 кустов всего
2) 8 : 20 · 100% = 40%
Ответ: 40%
В- 4/7в=4,2
3/7в=21/5
в=21/5×7/3
в=49/5=9 4/5
1 648 / 8 = 206
6 800 − 206= 6 594
78 / 4 = 19,5
19,5 + 6 594 = 6 613,5
5 2/3 - 4 1/3 = 1 1/3
12 1/3 - 9 1 /4 = 12 4/12 - 9 3/12 = 3 1/12
5 2/3 - 1/6 = 5 4/6 - 1/6 = 5 3/6 = 5 1/3
10 8/9 - 2/3 = 10 8/9 - 6/9 = 10 2/9
6 3/4 - 2 1/2 = 6 3/4 - 2 2/4 = 4 1/4
4 2/5 - 1 1/10 = 4 4/10 - 1 1/10 = 3 3/10