奥数题19.9+19.98+19.997+19.9996

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奥数题19.9+19.98+19.997+19.9996

奥数题19.9+19.98+19.997+19.9996
奥数题19.9+19.98+19.997+19.9996

奥数题19.9+19.98+19.997+19.9996
20-0.1+20-0.02+20-0.003+20-0.0004
=20x4-0.1234
=79.8766

19.9+19.98+19.997+19.9996
=(20-0.1)+(20-0.02)+(20-0.003)+(20-0.0006)
=(20+20+20+20)-(0.1+0.02+0.003+0.0004
=80-0.1234
=79.8766