972÷(720-21×33) 250+240÷8×5 840÷40+40×40 【175-(49+26)】×23 这些题的简便运算怎么写

2024-11-25 02:17:00
推荐回答(1个)
回答1:

972÷(720-21×33)
=972÷9÷(720÷9-21×33÷9)
=108÷(80-77)
=108÷3
=36

250+240÷8×5
=250+30×5
=240+150
=390

840÷40+40×40
=21+1600
=1621

【175-(49+26)】×23
=【175-75】×23
=100×23
=2300