Вот правильний ответ 100%
1. 4х+4=-6х-5
4х+6х=-5-4
10х=-9
х=-9/10= -0,9
2. 3х+3=-2-7х
3х+7х=-2-3
10х=-5
х=-5/10=-0,5
3. 7-6х=-4х-6
-6х+4х=-6-7
-2х=-13
х= 13/2 = 6,5
4. 9-4х=-9х-4
-4х+9х=-4-9
5х=13
х=13/5 = 2,6
Sin(3x-2x)=-0,5
sinx=-0,5
x=(-1)^(n+1)*π/6+πn,n∈z
(ab-b^2+a^2-ab)/a^2b=(a^2-b^2)/a^2 b
Cost = 3/4 cos(t/2) = ((1 + cost)/2)^(1/2) = ((1 + 3/4)/2)^(1/2) = (7/8)^(1/2) = (7^(1/2))/(2*(2^(1/2))) sin(t/2) = (1 - cos^2(t/2))^(1/2) = (1 - 7/8)^(1/2) = 1/(8^(1/2)) = 1/(2*(2^(1/2))) tg(t/2) = sin(t/2)/cos(t/2) = (1/(2*(2^(1/2))))/((7^(1/2))/(2*(2^(1/2)))) = 1/(7^(1/2)) ctg(t/2) = 1/tg(t/2) = 7^(1/2)<span> </span>