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• a + b = 1200 b + c = 1100 -------------------- - a - b = - 1200 b + c = 1100 _______________ - a + c = - 100 a - c = 100 ************ - c = 100 - a ou c = a - 100 ********** Afinal quanto vale a+b 1200 ou 1500 ??????????????

  in Sabendo que a + b = 1200, b + c = 1100 e a + b = 1500,então a + b + c vale:? Comment by lucy-murray_60b5053950903 May 2021