1/18/(22/39)*45/91*8/15
=8/18*39/22*45/15*1/91
=4/9*39/22*3/91
=3/9*4/22*39/91
=1/3*2/11*39/91
=39/3*2/11*1/91
=13*2/11*1/91
=13/91*2/11
=1/7*2/11
=2/77
77分之2
11／18÷22／39×45／91×8／15
=11／18×39／22×45／91×8／15
=39／36×45／91×8／15
=15／28×8／15
=2／7
=2/77
2/77
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