来自马占飞的问题
【下列各题,能用简便的要用简便方法计算.①17.25+3.05+2.75+3.95②24×(34+56-12)③1316×(913×17-913)④(78-516)×(59+23)】
下列各题,能用简便的要用简便方法计算.①17.25+3.05+2.75+3.95②24×(34+56-12)③1316×(913×17-913)④(78-516)×(59+23)


【下列各题,能用简便的要用简便方法计算.①17.25+3.05+2.75+3.95②24×(34+56-12)③1316×(913×17-913)④(78-516)×(59+23)】
下列各题,能用简便的要用简便方法计算.①17.25+3.05+2.75+3.95②24×(34+56-12)③1316×(913×17-913)④(78-516)×(59+23)



①17.25+3.05+2.75+3.95,=(17.25+2.75)+(3.05+3.95),=20+7,=27;②24×(34+56-12),=24×34+24×56-24×12,=18+20-12,=26;③1316×(913×17-913),=1316×913×17-1316×913,=916×17-916,=916×16...

