(1)6×3又9分之5÷2又5分之2÷1又3分之2
=6× (32/9)×(5/12) ×(3/5) = 16/3
(2)51÷1又9分之8×2又9分之2
=51× (9/17)×(20/9)=(51×9×20)/(17×9)=340/3
注：“/”为分数线