1)14 xy^2 / 35 x^3 z= 2 y^2 / 5 x^2 z;
2) 9(x+z)^4 / 3(x+z)^6= 3/ (x+z)^2;
3) 2 (a- b) ^5 / 18(b - a)^2= (a- b)^5 / 9(a - b)^2= (a - b)^3 / 9.
1. 8^13 / 8^11 = 8^(13 - 11) = 8^2 = 64;
2. 81 / 3^6 = 81 / 3^2*3^4 = 81/ 9*81 = 1/9;
3. 6^4 / 2^3 = (3*2)^4 / 2^3 = 3^4 * 2^4 / 2^3 = 3^4 * 2^(4 - 3) = 81 *2^1 = 81 *2 = 162.
Вот ответ:
4cos^2 x+4sinx-1=0
4(1-cos^2x)+4sinx-1=0
4-4sinx^2+4sinx-1=0
-4sinx^2+4sinx+3=0/(--1)
4sinx^2-4sinx-3=0
sinx=y
4y^2-4y-3=0
D=64 x1=1/2 x2=1,5
sinx=1/2
x=п/6+2пк и x=5п/6+2пк
(a)
a30=a1+29d
a1=a30-29d
a1=128-4*29=12