Найдите значение выражения (0,6-3/14)-(2/7-0,4)=?

Question

Найдите значение выражения (0,6-3/14)-(2/7-0,4)=?

Answer 1

1) 0,6 - 3/14 = 6/10 - 3/14 = 3/5 - 3/14 = (3*14-3*5)/70 = (42-15)/70 = 27/70

2) 2/7 - 0,4 = 2/7 - 4/10 = (2*10 - 4*7)/70 = (20 - 28)/70 = -8/70

3) 27/70 - (-8/70) = 27/70 + 8/70 = (27+8)/70 = 35/70 = 1/2 = 0,5

 

(0,6-3/14)-(2/7-0,4)=0,5

Answer 2

(0,6-3/14)-(2/7-0,4)=0,5

 

1) 0,6-3/14=3/5-3/14=42/70-15/70=27/70

2) 2/7-0,4=2/7-4/10=20/70-28/70=-8/70

3) 27/70-(-8/70)=27/70+8/70=35/70=1/2=0,5