Решить дроби (1/2+1/5) : 2- 3/10

Question

Решить дроби (1/2+1/5) : 2- 3/10

Answer 1

1) ( 1/2 ) + ( 1/5 ) = ( 5/10 ) + ( 2/10 ) = 7/10 
2) ( 7/10 ) : 2 = 7/20 
3) ( 7/20 ) - ( 3/10 ) = ( 7/20 ) - ( 6/20 ) = 1/20