解:24×9分之5-12分之5×9等于( 115/12 )
∵已知需求出24×9分之5-12分之5×9等于多少
∴24 × 9分之5 - 12分之5 × 9
= 24 × 5/9 - 5/12 × 9
= 40/3 - 15/4
= (40×4)/(3×4) - (15×3)/(4×3)
= 160/12 - 45/12
= (160-45)/12
= 115/12
答:24×9分之5-12分之5×9等于115/12
24*(5/9-5/12)×9
=24*(20/36-15/36)*9
=24*5/36*9
=6*5
=30