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Ta có hình vẽ:
b O a x y
Ta có : xOb + xOy = 180 ( tg 3 góc trong tam giác )
Hay : xOb + 70 = 180
=> xOb = 110
Mà aOb là góc đối đình với góc xOy
=> aOy là góc đối đình với góc xOb
Ta có Om là tia phân giác góc xOy
=> mOy = 70/2 = 35
Lại có: aOm = mOy + aOy
Hay aOm = 35 + 110
=> aOm = 145
Còn 2. sai đề nhé bạn. Mình vẽ hình không chuẩn lắm.
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