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Khanh0000
2 năm trước
tren nua mat phang bo chua tia Ox, ve tia oy va oz sao cho xOy= 40 do xOz = 80 do a,tinh goc yOz b, tia Ox co phai la tia phan giac goc xOz khong ? c, ve tia Om la tia doi cua tia Ox. tinh goc yOt
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