Question

уравнение 2(x+1)+½(x-1)=7/4x

Answer 1

(2(x+1)+1)/(2-(x-1)=7/4x
(2x+2+1)/(2-x+1)=7/4x

(2x+3)/(3-x)=7/4x|*4x*(3-x)

4x(2x+3)=7*(3-x)

8x^2+12x=21-7x

8x^2+12x+7x-21=0

8x^2+19x-21=0

D=361-4*8*(-21)=1033

x1=(-19+корень (1033))/16

x2=(-19-корень (1033))/16