<span> (900*900):5-(10 000+100 000)= 52 000
900*900=810 000
810 000 :5=162 000
10 000+100 000=110 000
162 000 -110 000=52 000</span>
...................))))))))
1.8
2.3
3.4
4.6
5.-4
6.2
7.15
8.-7
9.4
10.-2
11.-13
12.-3
13.18
13.6
15.-16
1,9x+3,34x-2,24x=30,66
3x=30,66
x=30,66:3
x=10,22
==============
96,41x-88,24x+1,83x=0,0202
10x=0,0202
x=0,0202:10
x=0,00202