crwdns2934241:0crwdne2934241:0 Annaa

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My calculator can't work, what should I do?

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I bought a calculator last month. But I don't know what's going on, it's always good or bad. Sometimes he can't [https://www.allicdata.com|display] what I typed. what should I do?

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Casio FX-115MS

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open