用简便方法计算45x78-48x28

2024-11-18 13:49:40
推荐回答(2个)
回答(1):

45x78-48x28
=3510-1344
=2166
不能简便

回答(2):

45x78-48x28
=78*48-78*3-48*28
=48*(78-28)-78*3
=48*50-226
=2400-226
=2174