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Dau 20 puncte+coroana
Aflati x si apoi masura unghiurilor
a. 0x+20=2x+10
b. 8x+20=2x+10


Răspuns :

a) 0x + 20 = 2x + 10

20 = 2x + 10
2x + 10 = 20
2x + 10 - 20 = 20 - 20
2(x - 5) = 0
x = 5

b) 8x + 20 = 2x + 10

8x = 2x - 10
8x + 20 - 20 = 2x + 10 - 20
6x = -10
8x - 2x = 2x - 2x - 10
6x / 6 = -10 / 6
x = -5 / 3.