comment calculer astucieusement (1,5+5)× 26 et 7,9×16,3+7,9×83,7.... Pergunta de ideia declena22

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comment calculer astucieusement (1,5+5)× 26 et 7,9×16,3+7,9×83,7

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(1,5+5)× 26 =26x1.5 +26x5 = 39+130 = 169

7,9×16,3+7,9×83,7 = 7.9(16.3+83.7) = 7.9(100) = 790

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