4,2p-p=5,12 8,2t-4,4t=38,38 (10,49-s): 4,02=0,805 9k-8,67k=0,6699

4,2p-p=5,12
3,2p=5,12
p=5,12:3,2
p=1,6

8,2t-4,4t=38,38
3,8t=38,38
t=38,38:3,8
t=10,1

(10,49-s):4,02=0,805
10,49-s=4,02*0,085
10,49-s=3,2361
s=10,49-3,2361
s=7,2539

9k-8,67k=0,6699
0,33k=0,6699
k=0,6699:0,33
k=2,03