Помогите пожалуйста(по действиям).
а) ( 3/4 + 1/6 ) • 3 + ( 5/6 - 1/2 ) : 2/9 =
б) ( 1 1/5 + 2 3/10 ) : 1/2 + ( 6 3/4 - 2 2/3) : 1 1/6 =
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