7 - (2x - 2) · (4x + 1) = 2x · (5 - 4x) как???

Question

7 - (2x - 2) · (4x + 1) = 2x · (5 - 4x) как???

Comments

7 - (2x - 2)/ (4x + 1) = 2x·(5 - 4x)

Answer 1

7-(8х^2-8х+2х-2)=10х-8х^2
7-8х^2+8х-2х+2=10х-8х^2
9=8х^2-6х+10х-8х^2
4х=9
х=9/4
х=2 1/4= 2,25

7-(2*2,25-2)*(4*2,25+1)=2*2,25*(5-4*2,25)
7-(4,5-2)*(9+1)=4,5*(5-9)
7-2,5×10=4,5*(-4)
7-25=-18
-18=-18

Comments

7 - (2x - 2)/ (4x + 1) = 2x·(5 - 4x)