7/1,21/3,49/3,63/9........
1) 11, 10.
2) 11
3) он ехал 1 час со скоростю 33 км/ч
5.4x - 2.6x = 10.84 - 2.3
(5х+0.4х)-(2х+0.6х)=(10+0.84)-(2+0.3)
(5х-2х)+(0.4х-0.6х)=(10-2)+(0.84-0.3)
3х-0.2х=8+0.54
2.8х=8.54
х=8.54|<u>2.8</u>
854 |<u>280</u>
-840 3.05
1400
<u><em /></u><u> -1400</u>
0
x=3.05
(n:4-34)*6=150
(n:4-34)=150:6
(n:4-34)=25
n:4=25+34
n:4=59
n=59*4
n=236
90*(m-8)+60=510
90*(m-8)=510-60
90*(m-8)=450
m-8=450:90
m-8=5
m=5+8
m=13