简便计算:480*38+380*52.1999+999*999.280*36+360*=乘 快
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简便计算:480*38+380*52.1999+999*999.280*36+360*=乘 快
简便计算:480*38+380*52.1999+999*999.280*36+360
*=乘 快
简便计算:480*38+380*52.1999+999*999.280*36+360*=乘 快
480*38+380*52.
=48*380+380*52
=380*(48+52)
=380*100
=38000
1999+999*999.
=1999+(1000-1)*999
=1999+999000-999
=1999-999+999000
=1000+999000
=1000000
280*36+360
=28*360+360
=(28+1)*360
=29*360
=(30-1)*360
=10800-360
=10440