简便计算 34.5×8.23-3.45×10+277×0.345=?那么:200.3×20.05-20.03×200.4=?多少呀

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/05 03:25:50

简便计算 34.5×8.23-3.45×10+277×0.345=?
那么:200.3×20.05-20.03×200.4=?多少呀

34.5×8.23-3.45×10+277×0.345
=34.5×8.23-34.5×1+2.77×34.5
=34.5×(8.23-1+2.77)
=34.5×10
=345

34.5×8.23-3.45×10+277×0.345
=34.5×8.23-34.5×1+34.5×2.77
=34.5×(8.23-1+2.77)
=34.5×10
=345

简便计算 :
34.5 × 8.23 - 3.45 × 10 + 277 × 0.345
=3.45 × 82.3 - 3.45 × 10 + 27.7 × 3.45
=3.45 × (82.3 -10+ 27.7)
=3.45 × 100
=345