1) 240-93=147 (дер.) кленов
2) 147*2=294 (дер.) сосен
3) (240+294):3=178 (дер.) елей
4) 240+147+294+178=859 деревьев в роще
200:13х32+87-215+54:21=200*32/13-128+54/21=<span>6400/13-128+54/21=</span>
<span>=492 4/13-128+2 12/21=364 4/13+2 4/7=366 4/13+4/7=366 28/91+52/91=
=366 80/91</span>
Дано: a+b/2=8.8 , a-? b-? a=b+2.1
(b+2.1+b)/2=8.8
2b+2.1=17.6
b=7.75
a=b+2.1=7.75+2.1=9.85