(1+2/5)*(1-2/5)*(1+2/7)*(1-2/7)*.*(1+2/2005)*(1-2/2005) 简便计算
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(1+2/5)*(1-2/5)*(1+2/7)*(1-2/7)*.*(1+2/2005)*(1-2/2005)简便计算(1+2/5)*(1-2/5)*(1+2/7)*(1-2/7)*.*(1+2/20
(1+2/5)*(1-2/5)*(1+2/7)*(1-2/7)*.*(1+2/2005)*(1-2/2005) 简便计算
(1+2/5)*(1-2/5)*(1+2/7)*(1-2/7)*.*(1+2/2005)*(1-2/2005) 简便计算
(1+2/5)*(1-2/5)*(1+2/7)*(1-2/7)*.*(1+2/2005)*(1-2/2005) 简便计算
=(1-2/5)(1+2/5)(1-2/7)(1+2/7)……(1-2/2005)(1+2/2005)
=3/5 × 7/5×5/7 × 9/7×7/9 ×…… × 2005/2003×2003/2005 ×2007/2005
=3/5×2007/2005
=6021/10025
(1+2/5)*(1-2/5)*(1+2/7)*(1-2/7)*.......*(1+2/2005)*(1-2/2005)
=7/5*3/5*9/7*5/7*...*2007/2005*2003/2005
=(7/5*9/7*...*2007/2005)*(3/5*5/7*...*2003/2005)
=2007/5*3/2005
=6021/10025
=(1-2/5)(1+2/5)(1-2/7)(1+2/7)……(1-2/2005)(1+2/2005)
=3/5 × 7/5×5/7 × 9/7×7/9 ×…… × 2005/2003×2003/2005 ×2007/2005
=3/5×2007/2005
=6021/10025
-2,-1,2,5,( )
5,2,1,1,
计算:(5+1)(5^2+1)(5^4+1)...(5^256+1)+1
1、1、2、3、5、( )、( ).
5-2=()+1
1 ,2 ,5 ,29 ,)
1-3/5+1/2-2/5
( ) 比2/5米多1/5
(5y+1)(5y^2-5y+1)-5(1+2y)(1-2y)
[(0.75+5/1)÷0.25+5/2]×2/5
1+5+5+5+5+3+2+2+2+2+2+2+1+2+5
1+2+5+51+2+5+5
1/2 1/2 1/2 2/5 5/16 ()数字推理说明为什么啊
1.(1+1/2+1/3+1/4)*(1/2+1/3+1/4+1/5)-(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4)=2.(1+1/2+1/3+1/4+1/5)*(1/2+1/3+1/4+1/5+1/6)-(1+1/2+1/3+1/4+1/5+1/6)*(1/2+1/3+1/4+1/5)=
1/1*3=1/2(1-1/3)1/3*5=1/2(1/3-1/5)1/5*7=1/2(1/5-1/7).1/17*19=1/2(1/17-1/19)所以1/1*3+1/3*5+1/5*7+.1/17*19=1/2(1-1/3)+1/2(1/3+1/5)+1/2(1/5-1/7)+.1/2(1/17-1/19)=1/2(1-1/3+1/3-1/5+1/5-1/7+1/7.+1/17-1/19)=1/2(1-1/1
简便计算:(1+2/3)×(1-2/3)×(1+2/5)×(1-2/5)×.×(1+2/99)×(1-2/99)
(1+2/3)×(1- 2/3)×(1+2/5)×(1- 2/5)×...×(1+2/99)×(1- 2/99)=?
(-1 2/3)乘1/5-|-5/6|除以(+ 2 1/2)等于多少?