5+(1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90)
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5+(1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90)5+(1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90)5+
5+(1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90)
5+(1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90)
5+(1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90)
1.原式=1-2+3-4+5-6+7-8+9+1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90
=5+1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90
=1+1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90
=1+1-1/2+1/2-1/3+1/3-1/4+……+1/9-1/10
=2-1/10
=1又9/10
2.原式=(104/99+104/33+104/11)÷(100/99+100/33+100/11)
=[104*(1/99+1/33+1/11)]÷[100*(1/99+1/33+1/11)]
=104÷100
=26/25
打字不易,
1/2+5/6+11/12+19/20+...+9898/9900
1/2+5/6+11/12+19/20如何解
1/2+5/6+11/12+19/20.9890/9900 不是1/2+5/6+11/12+19/20.9899/9900 急
1/2-5/6+1/12-19/20+1/30-41/42
1/2-5/6+1/12-19/20+1/30-41/42
5+(1/2-5/6+1/12-19/20+1/30-41/42+1/56-71/72+1/90)
1+1/2+5/6+11/12+19/20+……+9899/9900=?
1/2+5/6+1/12+19/20+29/30+.9701/9702+9899/9900=
1/2+5/6+1/12+19/20+29/30.9701/9702+9899/9900=
1/2+5/6+1/12+19/20+29/30+.9701/9702+9899/9900=
((-14/5)^4*(-10/7)^3*(-5/12)^2*(-3/20)^1)/|5/6-13/12+19/20-31/30|
-2/3+(-1/6)-1/4-1/2=-5/6-3/4=-19/12这道题对不对?
找规律.2,3,5,8,12,_ 2/1,6/5,12/11,20/19,_,42/41
1+6分之5-12分之19
(1+1*2)-(2+5*6)+(3+1*12)-(4+19*20)+(5+1*30)-(6+41*42)+(7+1*56)-(8+71*72)+(9+1*90)
1*1/2-2*5/6+3*1/12-4*19/20+5*1/30-6*41/42+7*1/56-8*71/72+9*1/90
找规律填空:1/2、5/6、11/12、19/20、( )、41/42
1/2+5/6+11/12+19/20+29/30+41/42+55/56=怎麽做?