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问题: 两道数学计算题

200.5*10%+2.005*490+0.2005*5000


3333*3333+9999*8889

解答:

200.5*10%+2.005*490+0.2005*5000 =
200.5*0.1+2.005*490+0.2005*5000 =
20.05*1+20.05*49+0.20.05*50 =
20.05*(1+49+50) =
20.05*100 =
2005



3333*3333+9999*8889=
3333*3*(1111)+9999*8889=
9999*(1111)+9999*8889=
9999*(1111+8889)=
9999*(10000)=
99990000