19.88+9.9*198.8(简算)

来源:学生作业帮助网 编辑:作业帮 时间:2024/04/29 04:31:04

19.88+9.9*198.8(简算)
19.88+9.9*198.8(简算)

19.88+9.9*198.8(简算)
19.88+9.9*198.8
=19.88+9.9*(19.88*10)
=19.88+19.88*(9.9*10)
=19.88+198.88*99
=19.88*(1+99)
=19.88*100
=1988

1988

19.88*(1+9.9*10)=19.88*(100)=1988

原式=19.98+9.9*198.8
=19.98*(1+99)
=19.98*100
=1998