280×36+360×72的简便计算怎么算啊?
问题描述：
280×36+360×72的简便计算怎么算啊?
答
原式=140×72+360×72
=72*(140+360)
=72*500
=36000
答
将36提出
36(280+10*72)=36*1000=36000
答
=28*10*36+360*72
=28*360+360*72
=360*(28+72)
=360*100
=36000