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180 derajat = 50 derajat + 2x + 3x
180-50 = 5x
5x = 130
x = 130/5 = 26
B = 2x = 2(26)= 52 derajat
C = 3x = 3(26) = 78 derajat
50° + 2x + 3x = 180°
5x = 180° - 50°
5x = 130°
x = 26°
< B = 2.26° = 52°
< C = 3.26° = 78°
Semoga membantu ya :)