3.9+3.99+3.999+…3.9999999999求算式的和的整数部分,

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3.9+3.99+3.999+…3.9999999999求算式的和的整数部分,3.9+3.99+3.999+…3.9999999999求算式的和的整数部分,3.9+3.99+3.999+…3.9999

3.9+3.99+3.999+…3.9999999999求算式的和的整数部分,
3.9+3.99+3.999+…3.9999999999求算式的和的整数部分,

3.9+3.99+3.999+…3.9999999999求算式的和的整数部分,
3.9+3.99+3.999+…3.9999999999
=4-0.1+4-0.01+4-0.001+...+4-0.0000000001
=4x10-0.1111111111
=40-0.1111111111
=39.8888888889
算式的和的整数部分是39

3.9+3.99+3.999+…3.9999999999
=(4-0.1)+(4-.0.01)+....(4-0.0000000001)一共10个括号
=40-0.1111111111
整数部分39

整数部分39