<span>12-40:k=4</span>
<span>40:k=8</span>
<span>k=5
(30-n):2=9</span>
<span>30-n=18</span>
<span>n=12
7*b-15=6</span>
<span>7b=21</span>
<span>b=3
20:(x:9)=4</span>
<span>x:9=5</span>
<span>x=45
(9*t+37):8=8</span>
9t+37=64
9t=27
t=3
В чем вопрос заключается?
1) 14*x=8*35
14*x=280
x=280/14
x=20
2)28*x=7*12
28*x=84
x=84/28
x=3
3) 6*x=4*18
6*x=72
x=72/6
x=9
11 20 б) 12 21 30 В) 22 31 40