<em>0.4*(6n-7)=0.5*(3n+7)</em>
<em>2.4n-2.8=1.5n+3.5</em>
<em>2.4n-1.5n=2.8+3.5</em>
<em>0.9n=6.3</em>
<em>n=6.3/0.9</em>
<em>n=63/9</em>
<em>n=7</em>
<em />
<em />
(х-1 5/7) + 22 4/7=26
х- 1 5/7 + 22 4/7=26
х= 26+1 5/7 - 22 4/7
х= -5 2/7
Ответ:
.............................
1 1*√3 √3
```` = ````````` = ````````
√3 √3 *√3 3
√10 + 8 (√10 +8)(√10 +8) (√10+8)² 10+16√10 +64 -37-8√10
``````````` = ````````````````````````` = `````````` = ```````````````````` = ``````````
√10 - 8 (√10 -8)(√10+8) 10 - 64 - 54 27
1 5+√5 5+√5 5+√5
````` = ``````````````````` = ``````````` = ````````````
5-√5 (5- √5)(5+√5) 25 -5 20