1)х-6=0
х=6
2) х-9=0
х=9
3) х+5=0
х=-5
4.02
45,25:25=1.81
0,65*3,4=2,21
21 : 3 = 7
18 : 3 = 6
27 : 3 = 9
12 : 3 = 4
30 : 3 = 10
Ответ: 7; 6; 9; 4; 10.
............................
8 * 4 = 32
9 * 4 = 36
7 * 4 = 28
3 * 4 = 12
1 * 4 = 4
Ответ: 32; 36; 28; 12; 4.
<span>2+1/5 = 10/5 + 1/5 = 11/5 = 2 1/5
7+1/5 = 7 1/5
10+5/6 = 10 5/6
15+7/12 = 15 7/12</span>