Question

решите пример пожалуйста (7/20+2/5)x2-1=

Answer 1

(7/20+2/5)*2-1= (7/20+8/20) * 2 - 1 =15/20 * 2 - 1 = 3/4 * 2 - 1 = 6/4 - 1 = 3 / 2 -1 = 1/2

Answer 2

(7/20+2/5)*2-1=(7/20+8/20)*2-1=15/20*2-1=30/20-1=30/20-20/20=10/20=1/2 или
(7/20+2/5)*2-1= (0,35+0,4)*2-1=0,75*2-1=1,5-1=0,5