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2 năm trước
Vẽ góc xOyˆ=60∘ Vẽ góc yOz kề bù với góc xOy. Vẽ Om là tia phân giác của góc xOy Vẽ On là tia phân giác của góc yOz. Tính và cho biết: xOnˆ=.....;mOnˆ=....;mOzˆ=.....
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