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β + 3β + β - 10° = 180°
5β = 180° + 10° = 190°
β = 190° : 5 = 38°
zad 10
5 * 3 - 11 = 4
15 - 11 = 4 TAK
9 - 3 = 5 NIE
3 * 3 + 2 * 3 = 12
9 + 6 = 12 NIE
(4 * 3 - 2)/5 = 2
(12 - 2)/5 = 2
10/5 = 2 TAK
zad 11
a)
17 + 5x = 32
5x = 32 - 17 = 15
x = 15/5 = 3
b)
6,5 + 3y = - 8,8
3y = - 8,8 - 6,5 = - 15,3
y = - 15,3 /3 = 5,1
c)
9x - 8 - 6x = 10
3x = 10 + 8 = 18
x = 18/3 = 6
zad 12
a)
α + 2α + 60° = 180°
3α = 180° - 60° = 120°
α = 120° : 3 = 40°
b)
a + 4a - 5 = 10
5a = 10 + 5 = 15
a = 15/5 = 3