1/2 +1/8+1/24+1/48+1/80怎么做

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1/2 +1/8+1/24+1/48+1/80怎么做
1/2 +1/8+1/24+1/48+1/80怎么做

1/2 +1/8+1/24+1/48+1/80怎么做
1/2+1/2*4+1/4*6+1/6*8+1/8*10
=1/2(1+1/2-1/4+1/4-1/6+1/6-1/8+1/8-1/10)
=1/2(1+1/2-1/10)
=1/2*14/10
=7/10

原式=40/80+10/80+2/48+1/48+1/80
=51/80+3/48
=51/80+1/16
=51/80+5/80
=56/80
=7/10

找出2，8，24，48，80的最小公倍数
也就是找出48与80的最小公倍数
48=4^2*3 80=4^2*5
则最小公倍数为4^2*3*5=240
同分母后
120/240+30/240+10/240+5/240+3/240
=168/240=7/10

7/10

2/1+6/1+12/1+24/1+48/1 简便计算：1/8+1/24+1/48+1/120 1/8+1/24+1/48+1/80 1/8+1/24+1/48+1/80简便计算 (1/8+1/15+1/24+1/35+1/48)*2 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 简算 8分之1+24分之1+48分之1 8/1+24/1+48/1.2400/1简便计算 8/1+24/1+48/1的简算, (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