1)2×(2^)^×х=128
2×2^4х=128
2^5х=128
32х=128
х=4
2) х=50
3)1/4х=1/3х
3х=4х
3х-4х=0
-х=0
х=0
Sin75=sin(30+45)=sin30*cos45+sin45*cos30= √2/2*(√3/2+1/2)=(√6+√2)/4
cos75=cos(45+30)=cos45*cos30 - sin45*sin30= √2/2(√3/2-1/2)= (√6-√2)/4
=1/(3x^2-10x+3. 3x^2-10x+3. не равно 0
D1=5^2-3*3=25-9=16=4^2: x1=(5-4)/3=1/3; x2=(5+4)/3=3
D(y)=(-беск;1/3) (1/3;3) (3;+беск)