111..1(2004个1)- 222..2(1002个2)等于A×A 求A.这是原题
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发布时间:2024-10-01 07:50
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时间:2024-12-02 17:09
111..1(2004个1)- 222..2(1002个2)
=111..1(2004个1)- 111..1(1002个1)- 111..1(1002个1)
=11...100...0(1002个1,1002个0)- 111..1(1002个1)
=111..1(1002个1)*(100...0(1002个0) -1)
=111..1(1002个1)*99...9(1002个9)
=111..1^2(1002个1)*9
=33...3^2(1002个3)
所以A=333...3(1002个3)