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4x=90+(90-x)
4x=90+90-x
5x=180
x=36
drugi kąt - 90-36=54
odp: kąty ostre mają 36 i 54
II kąt - x
III kąt - (90+x)/4
90+x+(90+x)/4 = 180
x+(90+x)/4 = 180-90
x+(90+x)/4 = 90 |*4
4x+90+x = 360
5x = 360-90
5x = 270 |:5
x = 54
I kąt - 90
II kąt - 54
III kąt - (90+54)/4 = 144/4 = 36
czyli 54 i 36 stopni =]