1/55+2/55+3/55+.10/55-10/155-11/155-12/155.20/155怎么做9/14=1/( )+1/( )+1/( )+1/( ) 最好能马上回答.我明天早上要交作业

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1/55+2/55+3/55+.10/55-10/155-11/155-12/155.20/155怎么做9/14=1/()+1/()+1/()+1/()最好能马上回答.我明天早上要交作业1/55+2/

1/55+2/55+3/55+.10/55-10/155-11/155-12/155.20/155怎么做9/14=1/( )+1/( )+1/( )+1/( ) 最好能马上回答.我明天早上要交作业
1/55+2/55+3/55+.10/55-10/155-11/155-12/155.20/155怎么做
9/14=1/( )+1/( )+1/( )+1/( ) 最好能马上回答.我明天早上要交作业

1/55+2/55+3/55+.10/55-10/155-11/155-12/155.20/155怎么做9/14=1/( )+1/( )+1/( )+1/( ) 最好能马上回答.我明天早上要交作业
1/55+2/55+3/55+.10/55-10/155-11/155-12/155.20/155
=(1+2+3+...+10)/55-(10+11+12+...+20)/155
=55/55-165/155
=1-(1+10/155)
=-2/31
9/14=1/( )+1/( )+1/( )+1/( ) =18/28
=1/28+1/7+1/4+1/14