(1/8+1/24+1/48+1/80+1/120+1/168)简便计算

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(1/8+1/24+1/48+1/80+1/120+1/168)简便计算
(1/8+1/24+1/48+1/80+1/120+1/168)简便计算

(1/8+1/24+1/48+1/80+1/120+1/168)简便计算
1/8+1/24+1/48+1/80+1/120+1/168
=1/2*[（1/2-1/4）+（1/4-1/6）+（1/6-1/8）+（1/8-1/10）+（1/10-1/12）+（1/12-1/14）]
=1/2*[1/2-1/14]
=3/14
能看懂吧,

1/8=(1/2)*(1/2-1/4)
1/24=(1/2)*(1/4-1/6)
……
1/168=(1/2)*(1/12-1/14)
原式=(1/2)*[(1/2-1/4)+(1/4-1/6)+……+(1/12-1/14)]
=(1/2)*[1/2-(1/4-1/4)-……-(1/12-1/12)-1/14]
=(1/2)*(1/2-1/14)
=(1/2)*(6/14)
=3/14

（1/8+1/24+1/48+1/80+1/120+1/168)
=（1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14）
=1/2*(1/2-1/4+1/4-1/6+......+1/12-1/14)
=1/2(1/2-1/14)
=3/28

1/8+1/24+1/48+1/80 1/8+1/24+1/48+1/80简便计算 (1/8+1/24+1/48+1/80+1/120+1/168+1/224)*64= (1/8+1/24+1/48+1/80+1/120+1/168+1/224)乘64 (1/8+1/24+1/48+1/80+1/120+1/168)简便计算（1/8+1/24+1/48+1/80+1/120+1/168）乘以56 （8/1+24/1+48/1+80/1+120//1+168/1）*42 1/8+1/24+1/48+1/80+1/120+1/168 （1/8+1/24+1/48+1/80+1/120+1/168）*56 42x(8/1+24/1+48/1+80/1+120/1+168/1)=?求求 42X（1/8+1/24+1/48+1/80+1/120+1/168）求解 8分之1+24分之1+48分之1+80分之1+120分之1=? 8/1+24/1+48/1+80/1+120/1要过程 1/8+1/24+1/48+1/80+.+1/360 = 1/8+1/24+1/48+1/80……+1/2400=? 1/2+1/8+1/24+1/48+1/80要简便哦 1/2 +1/8+1/24+1/48+1/80怎么做 1/3+1/8+1/15+1/24+1/35+1/48+1/63+1/80+1/99怎么求