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added by Psyché May 4, 2019, 6:43 p.m.
How much is 77 times 7?
629
539
749
519
He used the symbol of the period Gottfried Wilhelm Leibniz for the first time in his letter to John Bernoulli, writing that he did not like to use the (commonly used) × sign because he was often confused with the x sign, which denotes the unknown in the equation.
Psyché
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Correct this question
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Very interesting!
reach: rather globalcountingmathematicstechnology

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+1 Very interesting!  ---
+1 Very interesting!  Janice Stocker
+1 Very interesting!  Brainy2019
+1 Very interesting!  Manuxy123ang