500-720-40×15的差除以三十的简便计算

500-720-40×15的差除以三十的简便计算
2025-12-13 02:22:56
推荐回答(1个)
回答1:

500-(720-40x15)÷30
=500-(720-600)÷30
=500-120÷30
=500-4
=496