3*15=45 деревьев
Ответ: посадили 45 деревьев
2^x + 2^(x+1) = 6
2^x + 2^x*2 = 6
2^x * ( 1 + 2) = 6
2^x *3 = 6
2^x = 2^1
x = 1
10:5*3=6
1360:8*4=170*680
20:5*4=4*4=16
<span>4/9*(9/2y-3/2)-2/7*(7/6-7/2y)=4/9*9/2у-4/9*3/2-2/7*7/6+2/7*7/2у=2у-2/3-1/3+у=3у-1</span>