(-1)+(+2)+(-3)+(+4)+.+(-39)+(+40)=?用简便方法算
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x)5|S[CHS[CHhhjؖ`)+kxoi;m|t"}f:{: j,]c(LzR@@!.bŌl@ "w
1 2 3 4 ()
1()2()3()4
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),1/2-(3/4-3/8), 1/2+1/4-1/6 , 2/3+(1/2+1/4),
1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),1/2-(3/4-3/8),1/2+1/4-1/6 ,2/3+(1/2+1/4),
-1/2+(-1/6)-(-1/4)-2/3
(-1/2)-(-1/3)-(+1/4)
计算((1/3)^2)×4^0+((1/3)^4)×4^1+((1/3)^6)×4^2+…+((1/3)^2n)×4^(n-1)
0-(+2/1)-(+5/2)-(-4/3)-(+4/1)-(-5/3)
1,2,2,4,3,8,4,16,()()
3/4{3/4(1/2t-1/4)-8]=2/3t-1
1/2!+2/3!+3/4!+.+n/(n+1)!
0-21又2/3+(+3又1/4)-(-2/3)-(+1/4)
(1) (2) (3) (4) (5)
1)2)3)4)5)
1) 2) 3) 4) 5)
1/2+(-2/3)-(-4/5)+(-1/2)-(+1/3)
(-2.5)-(2,1/4)+2,1/3