tolong make rumus...rumusnya simpel aja

a. 21/4 + 5/3 - 13/6 = 126/24 + 48/24 - 52/24= 226/24 disederhanakan= 113/12

b. 3/4 - 1/4 + 7/5 = 15/20 - 5/20 + 28/20 = 38/20 disederhanakan = 19/10

maaf kalo salah

A. 21/4 + 5/3 - 13/6
=63+20/12 -13/6
=83/12 -13/6
=83-26/12
=57/12=4 6/12
B. 7,5-0,25+1,4
=8,65m