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18⋅(1736−518−712)\displaystyle { 18\cdot \left( {17 \over 36} - {5 \over 18} - {7 \over 12} \right) }18⋅(3617−185−127)
18⋅(1736−518−712)=18⋅(1736−1036−2136)=\displaystyle {18\cdot \left( {17 \over 36} - {5 \over 18} - {7 \over 12} \right)= 18 \cdot \left( {17 \over 36} - {10\over 36} - {21 \over 36} \right) = }18⋅(3617−185−127)=18⋅(3617−3610−3621)=
=18⋅−1436=−142=−7\displaystyle { =18\cdot {-14 \over 36}={-14 \over 2}=-7}=18⋅36−14=2−14=−7