6 1/4 - ( 3 2/5 + 3/8 )=

6 1/4 - (3 2/5 + 3/8) = 6 1/4 - (3 16/40 + 15/40) = 6 1/4 - 3 31/40 = 6 10/40 - 3 31/40 = 2 19/40

1)3 2/5+3/8=17/5+3/8приводим к общему знам.136+15/40=151/40

2)6 1/4-151/40 =25/4-151/40приводим к общему зн.=250-151/40=99/40=2 19/40