8/1+24/1+48/1+80/1+120/1要过程

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8/1+24/1+48/1+80/1+120/1要过程8/1+24/1+48/1+80/1+120/1要过程8/1+24/1+48/1+80/1+120/1要过程1/8+1/24+1/48+1/80+

8/1+24/1+48/1+80/1+120/1要过程
8/1+24/1+48/1+80/1+120/1要过程

8/1+24/1+48/1+80/1+120/1要过程
1/8+1/24+1/48+1/80+1/120
=1/2X4+1/4X6+1/6X8+1/8X10+1/10X12
=1/2(1/2-1/4 +1/4+1/6 +...+1/10-1/12)
=1/2(1/2-1/12)
=5/24

1/8+1/24+1/48+1/80+1/120
=1/2x1/4+1/4x1/6+1/6x1/8+1/8x1/10+1/10x1/12
=1/2x(1/2-1/4 +1/4+1/6 +...+1/10-1/12)
=1/2x(1/2-1/12)
=5/24

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 1/3+1/8+1/15+1/24+1/35+1/48+1/63+1/80+1/99怎么求 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