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I kąt - 30
II kąt - x
III kąt - y
x-y = 12
30+x+y = 180
x = y+12
x+y = 180-30
x = y+12
x+y = 150
x = y+12
y+12+y = 150
x = y+12
2y = 150-12
x = y+12
2y = 138 |:2
x = y+12
y = 69
x = 69+12
y = 69
x = 81
y = 69
zadanie 2
cyfra jedności - x
cyfra dziesiątek - y
liczba: x+10y
x+y = 9
x+10y+2x = 62
x+y = 9
3x+10y = 62
x = 9-y
3(9-y)+10y = 62
x = 9-y
27-3y+10y = 62
x = 9-y
7y = 62-27
x = 9-y
7y = 35 |:7
x = 9-y
y = 5
x = 9-5
y = 5
x = 4
y = 5
liczba: 54
180 - 30 = 150
150:2 = 75
12:2 = 6
75 - 6 = 69
75 + 6 =81
69 - jeden kąt
81- drugi kąt
spr.69 +81 + 30 =180
(180°-30°-12°)/2=138°/2=69°
69°+12°=81°
odp. a - 30°, b - 81°, c - 69°
Zad.2
x- cyfra jedności
y- cufra dziesiątek
x+10y - liczba szukana
x+y=9
10y+x+2x=62
9+9y+2x=62
9y+2x=53
7y+18=53
7y=35
y=5
x=9-y
x=9-5
x=4
x+10y - 4+10*5=54