145+263+55-198的简便计算怎麽写

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145+263+55-198的简便计算怎麽写

145+263+55-198的简便计算怎麽写
145+263+55-198的简便计算怎麽写

145+263+55-198的简便计算怎麽写
145+263+55-198
=145+55+263-(200-2)
=200+263-200+2
=263+2
=265

145+263+55-198
=(145+55)+263-(200-2)
=200+263-200+2
=265

145+263+55-198
= (145+55) - 200 +2 +263
=200-200 +(2+263)
=0+265
=265

145+55-200+2+263=265