(3/35+1/70+1/105)÷1/140

Răspuns :

(3/35+1/70+1/105)÷1/140 =

= (18+3+2)/210 : 1/140 =

= 23/210 * 140 =

= 23/3 * 2 =

= 46/3

(3/35 + 1/70 + 1/105) : 1/140 =

= (18 + 3 + 2)/210 : 1/140 

= 23/210 × 140 

= 23/3 × 2 

= 46/3