Вычислите: 1) 1/6-(5/12-7/12)=?, 2)-13-(20-32)=?,3)-4,5-(7-9,5)=?, - 5/8-(5/8-1)=?, -18-(9-5)=?, -0,25-(3-2,25)=?, - 2/9-(1 -8/9)=?
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