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2014-11-14T20:22:20+02:00
A+b+a-b=77+13
2a=90
a=45
a+b=77
45+b=77
b=77-45
b=32
2 5 2
2014-11-14T20:27:03+02:00
A+b+a-b=77+13 2×a = 90 a = 90 : 2 a = 45 a + b=77 45 + b =77 b = 77-45 b = 32 PROBĂ : a + b = 45 + 32 a + b = 77 a - b = 45 - 32 a - b = 13