20/1 ÷{( 2/5 - 4/3) *5/2+4/1} = ?

Question

20/1 ÷{( 2/5 - 4/3) *5/2+4/1} = ?

Answer 1

(2/5) - (4/3) = (6/15) - (20/15) = (6-20)/15 = -14/15 
(-14/15)*(5/2) = -7/3 
(-7/3) + 4 = (-7/3) +(12/3) = (12-7)/3 = 5/3 
20:(5/3) = 20*3/5 = 4*3 = 12

Comments

Спасибо спасибо спасибо