200.5*10%+2.005*490+0.2005*5000 简便
问题描述：
200.5*10%+2.005*490+0.2005*5000 简便
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第二个的1111怎么来的我哥知道他不在 等他回来告诉你- -我明天交啊