(2 - √5) * (7 - 2x) > 0
(√5 - 2) * (2x - 7) > 0
2x - 7 >0
2x > 7
x > 3.5
Ответ: x ∈ (3.5 ; +∞)
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