9÷1.5 + 9÷4.5
= (9×2)÷(1.5×2) + (9×2)÷(4.5×2)
= 9×2÷3 + 9×2÷9
= 9÷3 ×2+ 9÷9×2
= 3 ×2+ 1×2
= 6 + 2
= 8
9除以1.5加9除以4.5怎么算简便?
9÷1.5 + 9÷4.5
= (9×2)÷(1.5×2) + (9×2)÷(4.5×2)
= 9×2÷3 + 9×2÷9
= 9÷3 ×2+ 9÷9×2
= 3 ×2+ 1×2
= 6 + 2
= 8