1-1/5-1/45-1/117-1/221-1/375
来源:学生作业帮 编辑:大师作文网作业帮 分类:数学作业 时间:2024/09/29 14:33:57
1-1/5-1/45-1/117-1/221-1/375
1-1/5-1/45-1/117-1/221-1/357
=1-1/(1x5)-1/(5x9)-1/(9x13)-1/(13x17)-1/(17x21)
=1-[1/(1x5)+1/(5x9)+1/(9x13)+1/(13x17)+1/(17x21)]
=1-[1/4(1-1/5)+1/4(1/5-1/9)+1/4(1/9-1/13)+1/4(1/13-1/17)+1/4(1/17-1/21)]
=1-1/4(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21)
=1-1/4(1-1/21)
=1-1/4x20/21
=1-5/21
=16/21
=1-1/(1x5)-1/(5x9)-1/(9x13)-1/(13x17)-1/(17x21)
=1-[1/(1x5)+1/(5x9)+1/(9x13)+1/(13x17)+1/(17x21)]
=1-[1/4(1-1/5)+1/4(1/5-1/9)+1/4(1/9-1/13)+1/4(1/13-1/17)+1/4(1/17-1/21)]
=1-1/4(1-1/5+1/5-1/9+1/9-1/13+1/13-1/17+1/17-1/21)
=1-1/4(1-1/21)
=1-1/4x20/21
=1-5/21
=16/21
2、125 ×14/17+375×1/17 3、1×5/1 + 5×10/1 + 10×15/1+……+45 ×50/1
算式:(6又665分之117+8又1995分之1112)除以(5又13分之1+3又17分之13+221分之41)分之1
(6×117÷665+8×1112÷1995)÷1÷5×1÷13+3×13÷17+41÷221
求比值:4分之1吨:375千克;3分之2时:45分;1又2分之1:0.75;5分之3吨:400千克
1+1-1+1-1+1*52+65+45等于?
1/1+1/3+1/6+1/10+.1/45= 请简算 答案为9/5
∵x=45+1=4(5+1)(5+1)(5-1)=
1+
-1
(1)-( )-( )-( )
[1]
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