Log₃₂(2x²+14x)=4/5;⇒(2x²+14x)>0;
log₂⁵(2x²+14x)=4/5;⇒
1/5·log₂(2x²+14x)=4/5;⇒
log₂(2x²+14x)=4;⇒
2⁴=2x²+14x;⇒
2x²+14x-16=0
x²+7x-8=0
x₁,₂=-7/2⁺₋√(49/4+8)=-7/2⁺₋√81/4=-7/2⁺₋9/2;
x₁=-7/2+9/2=1;
x₂=-7/2-9/2=-8;
Cos7x+cosx=0
2cos(7x+x)/2*cos(7x-x)/2=0
2cos4x*cos3x=0
2cos4x=0 или cos3x=0
4x=pi/2+pi*n 3x=pi/2+pi*n
x=pi/8+(pi*n)/4 x=pi/6+(pi*n)/3
345,348,340,358,354,350,380,384,385,305,304,308,403,405,408,430,435,438,450,453,458,480,483,485,503,504,508,530,534,538,540,543,548,580,584,583,803,804,805,834,830,835,845,840,843,850,853,854
0,175°+0,36⁻² - 1⁴/³=1+ ((0,6)²)⁻² - 1=0,6⁻⁴=(3/5)⁻⁴=(5/3)⁴=5⁴/3⁴=625/81=7 ⁵⁸/₈₁
Объем куба v=а^3
2^3=8....