Question

give me right answer ​

Answer 1

$(a + b + c) {}^{2} = a {}^{2} + {b}^{2} + {c}^{2} + 2(ab + bc + ac) \\ {9}^{2} = 20 + 2(ab + bc + ac) \\ 81 - 20 = 2(ab + bc + ac) \\ 61 \div 2 = ab + bc + ac \\ ab + bc + ac = 30.5$

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