б на фотке
г вот
(1 6/19- 25/38):1 6/19= 1/2
X²-5x=0
x(x-5)=0
x=0, x=5
x²+7x+12=0
D=7²-4*12=49-48=1
x=(-7+1)/2=-6/2=-3
x=(-7-1)/2=-8/2=-4
(x²+9)/x=2x
x≠0
x²+9=2x²
2x²-x²-9=0
x²-9=0
(x-3)(x+3)=0
x=-3, x=3
1) (b² - 3)³ - ( b² - 3)· (b⁴ +3b²+9) = (b² - 3)³ -(b² - 3)³ =0
2) (n² - 1)· (n⁴ + n ² + 1) - (n² -1) ³ = (n² -1)³ - (n² -1)³=0
16^(log₄3-0,25*log₂3)=16^(0,5*log₂3-0,25*log₂3)=2^(4*(0,5*log₂3-0,25*log₂3))=
=2^(2*log₂3-log₂3)=2^(log₂9-log₂3)=2^log₂(9/3)=2^log₂3=3.
2^(2-log₂5)+(1/2)^log₂5=4/2^log₂5+2^log₂5⁻¹=4/5+1/5=1.