0,036 : 21 = 0,0017142857
А)21/10:7/5=21/10*5/7=3/2=1,5
Б)9/2:21/4=9/2*4/21=18/21=6/7
В)19/4:1/4-31/14*7=19/4:4/1-31/14*7=19-31/2=38/2-31/2=7/2=3.1/2=3,5
1) -4<-3
6>-7
-99>-100
789>-789
2)1|-33
2|6
3|-119
4|130
5|-6
6|6
7|-130
8|-35
9|-56
10|-6
3)-8+х=-67
х=-67+8
х=-59
х+(-47)=-56
х=-56+47
х=-9
-34-х=-25
-х=-25+34
х=-9
х-(-15)=-87
х+15=-87
х=-87-15
х=-102
Вот графическое решение примера