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Răspuns:
a)x+2x=90°
3x=90°
x=90°:3
x=30
b) x+1/8x=90°
9/8x=90°
x=90°:9/8
x=10°*8
x=80
c)x+(x20°)=90°
x+x+20°=90°
2x70°:2
x=35°
d)x+(x-40°)=90°
x+x-40°=90°
2x=130
x=130°:2
x=65°