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[" 20.In a "/ABC,/C=3/B=2(/A+/B)" ,then ...

[" 20.In a "/_ABC,/_C=3/_B=2(/_A+/_B)" ,then "/_B=?],[[" (a) "20^(@)," (b) "40^(@)," (c) "60^(@)," (d) "80^(@)]]

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