4分之33*5分之3*11分之12
=（33/4x12/11）x3/5
=9x3/5
=27/5
（4分之1-5分之1）*60
=1/4x60-1/5x60
=15-12
=3
（8分之5+7分之3）*8*7
=5/8x8x7+3/7x8x7
=35+24
=59
43*42分之19
=42x19/42+1x19/42
=19+19/42
=19又19/42