<span>(4a-b)-5a-3b=4a-b-5a-3b=4a-5a-b-3b=-a-4b
-(3x-0,4)+(0,4x-3)=-3x+0,4+0,4x-3=-2,6x-2,6
9-2(x+1)+x</span>=9-2x-2+x=7-x
1) 7X^2 - X = 0
X*( 7X - 1 ) = 0
X = 0
7X - 1 = 0
7X = 1
X = 1\7
ОТВЕТ: 0 и 1\7
2) 2X^2 - 14 = 0
2* ( X^2 - 7 ) = 0
X^2 - 7 = 0
X^2 = 7
X1 = + V 7
X2 = - V 7
Решение
sin3x - cos5x = 0
cos(π/2 - 3x) - cos5x = 0
- 2cos(π/2 - 3x + 5x)/2 * sin(π/2 - 3x - 5x)/2 = 0
1) cos(π/4 + x) = 0
π/4 + x = π/2 + πk, k ∈ Z
x = π/2 - π/4 <span>+ πk, k ∈ Z
x = </span>π/4 <span>+ πk, k ∈ Z
2) sin(</span>π/4 - 4x) = 0
4x - π/4 = πn, n ∈ Z
<span>4x = π/4 + πn, n ∈ Z
</span>x = π/16 + πn/4, n ∈ Z
x = π/16 - <span>наименьшее положительное решение </span>
Решение смотри в приложениях