2 out of 5 plus 0.4 equals X

2 out of 5 plus 0.4 equals X


I'll come



How about x + 1 / X-1 + 1-2x / 2x = 0,


Let me teach you! You see, this is a molecular formula, right on both sides at the same time × (x + 1) (1-2x), like this (x-1)) (1-2x) + 2x (x + 1) = 0 x-2x2-1 + 2x + 2x2 + 2x = 0 x + 2x + 2x-2x2 + 2x2 = 1 5x = 1, so x = 1 / 5, right!



After class, when x = 2012, find the value of the algebraic formula (x ^ 2-1) (x + 1) / (x ^ 2-x) / [1 + (x ^ 2 + 1) / 2x]
Now


(x^2-1)(x+1)/(x^2-x)÷[1+(x^2+1)/2x]=(x+1)²/x ×2x/(x+1)²=2