kenex - 2019-04-04, 13:22 Temat postu: 6*9 + (6+9) = 69 6*9 + (6+9) = 69 Angelfrost - 2019-04-04, 15:26 PROBLEM: Prove that 6*9 + (6+9) = 69 Step-by-step solution: Factorise 69 69 = 23 * 3 Factorise 6 * 9 6 * 9 = 2 * 3³ Factorise 6 + 9 6 + 9 = 15 = 3 * 5 Rewrite the equation 2 * 3³ + 3 * 5 = 3(2 * 3² + 5) Calculate the expression in parenthesis 2 * 3² + 5 = 2 * 9 + 5 = 18 + 5 = 23 Rewrite the equation 3(2 * 3² + 5) = 3 * 23 = 23 * 3 = 69 |
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