1.2(5/6r+0.4n)-1.8(5/9r-0.3 ) =
6/5*5/6r+6/5*2/5n-9/5*5/9r+9/5*3/10=
r+12/25n-r+27/50=12/25n+27/50
Ecли 0,3n, то
12/25n+27/50n=
24/50n+27/50n=
51/50n=1 1/50 n
8 - 100%
x-300%
Решения
8*300:100=24
---------------------------------------------------
24 - 100%
x - 25%
Решения
24*25:100=6
24-6=18
<span>480+540+600+660+?+1740=1020+1260+?+1740=1020+3000+?=4020+?</span>
4/15+7/30=8/30+7/30=15/30=1/2