Вычислите наиболее рациональным способом:
а) 1/2+2 2/3+1 1/2+1 1/3
б) (3/14-2/7+1/2)·14
в) 3 2/5·2 3/7·5·7
г) (12 2/9+24 2/3-16 2/15)÷2
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