In the figure14-23 MON is a straight line,If the angles a,β

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In the figure14-23 MON is a straight line,If the angles a,β and γ satisfy β：α=2：1,

and γ：β=3：1,then the angle β=_______.

再问：看不懂
再答：，γ：β=3：1，β：α=2：1（已知） ∴γ=3β，α=½β（等量转化） ∵∠AOB=180°（平角） ∴α+β+γ=180º 即½β+β+3β=180° ∴β=40°．故答案是40°．

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