12: (1/2+1/2+1/2+1/2)(2/7+2/7+2/7+2/7) * 21/8 Упростите числовое выражение

Question

12: (1/2+1/2+1/2+1/2)
(2/7+2/7+2/7+2/7) * 21/8
Упростите числовое выражение

Answer 1

12 : ( 1/2 + 1/2 + 1/2 + 1/2 ) = 12 : ( 4 * ( 1/2 )) = 12 : 2 = 6 
( 2/7 + 2/7 + 2/7 + 2/7 ) * 21/8 = ( 4 * ( 2/7 )) * 21/8 = 8/7 * 21/8 = 21/7 = 3