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U₂=2+x
U₃=6
2U₂ = U₁+U₃
2(2+x) = 3x+6
4+2x = 3x+6
4 - 6 = 3x-2x
-2 = x
a) x = -2
b) 2+x = 2+(-2)
2+x = 0
c) 3x = 3(-2)
3x = -6
8) 45.4 + (x.2x.3x) = 360°
180° + 6x = 360°
6x = 360°-180°
6x = 180°
x = 180°/6
x = 30°
a) Sudut terbesar = 45°+3x
= 45°+3(30°) = 45°+ 90° = 135°
b) Selisih sudut terbesar & kecil =135° - 45° = 90°