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　　1.JillandKaty_________________________withtheirclasstomrrowAaregoingtoswimmingBaregoingswimmingCgotoswimmingDgoswimming2.Theypromised————————————theworkinthreedaysAtofinishBfinishingCfinishesDfinis

　　1.JillandKaty_________________________withtheirclasstomrrow

　　AaregoingtoswimmingBaregoingswimmingCgotoswimmingDgoswimming

　　2.Theypromised————————————theworkinthreedays

　　AtofinishBfinishingCfinishesDfinished

　　3.若b+c分之一=1.c+a分之一=1,求b分之ab+1

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2020-11-09 06:05

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方亭

　　Abegoingtodosth.将来做某事

　　A promisetodosht.承诺做某事

　　由b+1/c=1

　　得：b=1-1/c=(c-1)/c,则1/b=c/(c-1),

　　由c+1/a=1

　　得：1/a=1-c,则a=1/(1-c),

　　因此

　　b/(ab+1)

　　=a+1/b

　　=1/(1-c)+c/(c-1)

　　=1/(1-c)-c/(1-c)

　　=(1-c)/(1-c)

2020-11-09 06:08:33

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