1.(1-1/2+1/3)+(1/2-1/3-1/4)
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1.(1-1/2+1/3)+(1/2-1/3-1/4)
2.39又65/68*17
3.(1又2/3+6又3/8+2又1/3+3又3/8)*(1-9/14)
4.3.25*1.28*0.25/(1又7/25*1/4*3又1/4)
5.8又4/5÷【87+0.625*(2又3/4-1.15)】
6.(3/4-3/4*2/5)/1/5*5
2.39又65/68*17
3.(1又2/3+6又3/8+2又1/3+3又3/8)*(1-9/14)
4.3.25*1.28*0.25/(1又7/25*1/4*3又1/4)
5.8又4/5÷【87+0.625*(2又3/4-1.15)】
6.(3/4-3/4*2/5)/1/5*5
1.(1-1/2+1/3)+(1/2-1/3-1/4)
=(1/2+1/3)+(3/6-2/6-1/4)
=5/6+1/6-1/4
=1-1/4
=3/4
2.39又65/68*17
=65*39/68*17
=65*39/4
=2535/4
=633又3/4
=(1/2+1/3)+(3/6-2/6-1/4)
=5/6+1/6-1/4
=1-1/4
=3/4
2.39又65/68*17
=65*39/68*17
=65*39/4
=2535/4
=633又3/4
1.(1/2)^-2+(1/4)^0+(1/2)^-3
1.(1-1/2+1/3)+(1/2-1/3-1/4)
1.(1-1/2-1/3-...-1/1996)x(1/2+1/3+1/4+...+1/1997)-(1-1/2-1/3
(1+1/2+1/3+...+1/2006)*(1/2+1/3+1/4+...1/2007)-(1+1/2+1/3+..
(1+1/2+1/3+1/4+1/5)*(1/3+1/4+1)-(1+1/3+1/4)*(1/2+1/3+1/4+1/5
1.|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+...+|1/2009-1/2008|=
1.计算【1/3-1/2】+【1/4-1/3】+【1/5-1/4】+.+【1/10-1/9】
奥数六年级1/2/(1+1/2)+1/3/(1+1/2)(1+1/3)+1/4/(1+1/2)(1+1/3)(1+1/4
(1-1/2)(1-1/3)(1-1/4).(1-1/99)(1-1/100)等于?
提问题(1+1/2+1/3+1/4)×(1/2+1/3+1/4+1/5)-(1/2+1/3+1/4)×(1+1/2+1/
1.一只一串分数:1/1;1/2;2/1;1/3;2/2;3/1;1/4;2/3;3/2;4/1.求:
1;(1-1/2^2)(1-1/3^2)(1-1/4^2)````````````(1-1/99^2)(1-1/100^