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
计算:1/55+2/55+3/55+.+54/55
计算 1/55+2/55+3/55+.+10/55-11/155-12/155-.-20/155
(1/55+2/55+3/55+~+10/55)-(11/155+12/155+~20/55)用简便算法,
(10-55/2×1)+(9-55/2×2)+(8-55/2×3)+……+(1-55/2×10)
(10-2/55*1)+(9-2/55*2)+(8-2/55*3)+...+(1-2/55*10)=
简便计算,(10-7/55*1)+(9-7/55*2)+(8-7/55*3)+...+(1-7/55*10)
(1+9/55)+(1+9/55×2)+(1+9/55×3)+……+(1+9/55×10)
1/55+2/55+3/55+.+10/155-11/155-12/155-.-20/155=?
1/55+2/55+3/55...+10/55-11/155-12/155-13/155-...-20/155
巧妙计算:1/55+2/55+3/55+…+10/55-11/155-12/155-13/155-…-20/155
(10-4/55*1)+(9-4/55*2)+(8-4/55*3)+...+(2-4/55*9)+(1-4/55*10)=?请把关键布骤写清楚
(10-3/55×1)+(9-3/55×2)+(8-3/55×3)+……+(2-3/55×9)+(1-3/55×10)=?(10-3/55×1)+(9-3/55×2)+(8-3/55×3)+……+(2-3/55×9)+(1-3/55×10)=?
简便计算:1/55+2/55+3/55+4/55+5/55+6/55+7/55+8/55+9/55+10/55-11/155-12/155-13/155-14/155-15/155-16/155-17/155-18/155-19/155-20/155应用题:姐妹俩养兔100只,姐姐养的1/3比妹妹的1/10多16只,姐姐养了多少只兔?思考题:(
1+5+3+6+55
10+2+3+2+245+5+25+3+5+2+5+1+55+5+5
怎样简便计算 (10-7/55*1)+(9-7/55*2)+(8-7/55*3)+······+(1-7/55*10)
巧算:(10-7/55*1)+(9-7/55*2)+(8-7/55*3)……(1-7/55*10
巧算:(10-7/55*1)+(9-7/55*2)+(8-7/55*3)+.+(1-7/55*10)