490乘以32加680乘以49怎样用简便计算来计算

2025-04-05 17:50:44
推荐回答(1个)
回答1:

原式
=490x32+680x49
=49x10x32+680x49
=49x320+680x49
=49x(320+680)
=49x1000
=49000

或者
=490x32+68x10x49
=490x32+68x490
=490x(32+68)
=490x100
=49000