5а- делимое
b-2 - делитель
1\3 - частное
(5a)/(b-2) = 1/3
b-2 = 5a/(1/3)
b-2 = 5a*3/1
b-2= 15a
b= 15a+2
В) 0.3/0.033=300/33= 100/11=9 1/11
г) 1.65/5.25=33/105=11/35
Sin π + cos π = 0+ (-1)= - 1
Т.Виета:
x₁ * x₂ = с =-2
x₁ + x₂ = -b = -4
x₁^2 + x₂^2 = <u>x₁^2 + x₂^2 + 2x₁*x₂</u> - 2x₁*x₂ =
= (x₁ + x₂)^2 - 2*(x₁ * x₂) = (-4)² - 2*(-2) = 16+4 = 20
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6x(x-y)+y(x-y)=(x-y)(6x+y)