648+203怎样简便计算

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648+203怎样简便计算648+203怎样简便计算648+203怎样简便计算648+203=(650-2)+(200+3)=650-2+200+3=(650+200)+(3-2)=850+1=851

648+203怎样简便计算
648+203怎样简便计算

648+203怎样简便计算
648+203
=(650-2)+(200+3)
=650-2+200+3
=(650+200)+(3-2)
=850+1
=851