作业帮(1/11+1/33+1/55+1/77)有无简便方法?
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(1/11+1/33+1/55+1/77)有无简便方法?
(1/11+1/33+1/55+1/77)有无简便方法?
(1/11+1/33+1/55+1/77)有无简便方法?
(1/11+1/33+1/55+1/77)
=1/11x(1+1/3+1/5+1/7)
=1/11x(105/105+35/105+21/105+15/105)
=1/11x176/105
=16/105
如果本题有什么不明白可以追问,
1/3+1/5+1/7+1/9+1/11+1/33+1/35+1/45+1/55+1/77
(1/11+1/33+1/55+1/77)有无简便方法?
11+22(1/2)+33(1/4)+44(1/8)+55(1/16)+66(1/32)+77(1/64)=
(1)11-22+33-44+55-66+77-88+99-100=? (2)11-22+33-4(1)11-22+33-44+55-66+77-88+99-100=?(2)11-22+33-44+……-n=?
1/3+1/5+1/7+1/9+1/11+1/33+1/35+1/45+1/55+1/77=?
1/3 + 1/5 + 1/7 + 1/9 + 1/11 + 1/33 + 1/35 + 1/45 + 1/55 + 1/77=?过程也要有,
3/1+5/1+7/1+11/1+33/1+35/1+45/1+55/1+77/1=?（/表示分数线）
1/3 +1/5 +1/7 +1/9 +1/11 +1/33 +1/35 +1/35 +1/45 +1/55 +1/77注意,是11个分子为1的分数相加!
1+2+3+4+5+6+7+8+9+10+11+22+33+44+55+66+77+88+99=?
1+2+3+4+5+6+7+8+9+99+88+77+66+55+44+33+22+11
1/3加1/5加1/7加1/9加1/11加1/33加1/35加1/45加1/55加1/77简算,
一道数学题.2004年“我爱数学”少年夏令营的题.1/3+1/5+1/7+1/9+1/11+1/33+1/35+1/45+1/55+1/77
1+2+3+4+5+6+7+8+9+11+22-33+33+44+55+66+77+88+99+12+13+14+15+16+17+18+19
1/11+2/22+3/33+4/44+5/55+6/66+7/77+8/88+9/99-10/100+11/110+12/120/13/130=
1/55+1/66+1/77+1/88+1/99
(1+22+33+44+55+66+77+88+99)÷3的余数是多少
1-99+2-88+3-77+4-66+5-55+6-44+7-33+8-22+9-11 谁能算出来
1+2+3+4+5+6+7+8+9+11+22+33+44+55+66+77+88+99+111+222+333+444+555+666+777+888+999=?