65-43+135-57怎么简便计算

问题描述:

65-43+135-57怎么简便计算

(65+135)-(43+57)

   65-43+135-57
  =65+135-(43+57)
  =200-100
  =100

(135+65)—(43+57)=200—100=100

65-43+135-57
=65+135-(43+57)
=200-100
=100

原式=(135+65)-(57+43)
=200-100
=100