240+260×24 72×125+125×5 87×240+24×130怎样巧算

问题描述:

240+260×24 72×125+125×5 87×240+24×130怎样巧算
应该是240+260×24。.72×125+125×5.87×240+24×130三道题怎样巧算

240+260×24
=240+240×24 +20×24
=240×25 +480
=6000+48
0=6480
72×125+125×5
=125×80-125×3
=10000-375
=99625
87×240+24×130
=24×(130+870)
=24×1000
=24000