Question

321+543×89简便运算

Answer 1

321+543×89

Answer 2

321+543*89
=321+（321+222）*89
=321+321*89+222*89
=321*(89+1)+222*89
=321*90+222*(90-1)
=321*90+222*90-222
=543*(100-10)-222
=54300-5430-222
=48648

追问

太复杂

Answer 3

321+543×89
=321+543x(100-11)
=321+54300-5430-543
=54621-5973
=54621-6000+27
=48621+27
=48648

Answer 4

＜543×89＞+321