In triunghiul ABC , m(
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2015-11-14 00:09:03
AB²=AC²+BC²-2AC*BCcos120° AB²=25+9-2*3*5*(-1/2) AB²=25+9 +15 AB²=49 AB=7 as simple as that!
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AB²=AC²+BC²-2AC*BCcos120° AB²=25+9-2*3*5*(-1/2) AB²=25+9 +15 AB²=49 AB=7 as simple as that!