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4+4又1/2*6/7/9/14分之5--(1又5/6+1又11/18)=4+9/2×6/7×1/9×14/5-(1又15/18+1又11/18)=4+(9/2×1/9)×(6/7×14/5)-3又4/9=4+1/2×12/5-3又4/9=4+1又1/5-3又4/9=4+1又9/45-3又20/45=1又34/45…
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