作业帮(1/8+1/24+1/48+1/80+1/120+1/168+1/224)*64=
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(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)*64=
(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)*64
=（1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16）*64
=1/2*(1/2-1/4+1/4-1/6+.+1/14-1/16)*64
=32(1/2-1/16)
=16-2=14
(1/8+1/24+1/48+1/80+1/120+1/168+1/224)*64
=(1/2*4+1/4*6+1/6*8+1/8*10+1/10*12+1/12*14+1/14*16)*224
=((1/2)-(1/4)+(1/4)-(1/6)+(1/6)-(1/8)+(1/8)-(1/10)+(1/10)-(1/12)+(1/12)-(1/14)+(1/14)-(1/16))*(1/2)*64
=14
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