1/6、1/3、1/2( )、5/6、1.
1/6、1/3、1/2( )、5/6、1.
1.动脑筋计算:(1+1/2)*(1+1/4)*(1+1/6)*…* (1+1/10)*(1-1/3)*(1-1/5)*
6道计算题1.(1/2-1)(1/3-1)(1/4-1)(1/5-1)(1/6-1) 2.(-2)+(-5)-(-3)
1/6(3×-6)=2/5x-3
1/6【1/4{1/3(1/2X-1)+3}+5】=1
(-1/4)+5/6+2/3-1/2
数列找规律!(1)1,2,-3,-4,5,6,-7,-8(2)-1,-1/2,1/3,1/4,-1/5,-1/6,1/7
(1+1/2)*(1+1/4)*(1+1/6)*...*(1+1/2008)*(1-1/3)*(1-1/5)*(1-1/
(+1又3/4)-5/6-1又1/6+1/2
1/2*1/3+1/3*1/4+1/4*1/5+1/5*1/6 (简便方法)
(1)1+1/2+1/3+1/4+1/5+1/6+1/7+1/14+1/28
巧算:(1/2+1/3)-(1/3+1/4)+(1/4+1/5)-(1/5-1/6)-(1/6+