(8/1+24/1+48/1+80/1+120//1+168/1)*56
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(8/1+24/1+48/1+80/1+120//1+168/1)*56
(8/1+1/24+1/48+1/80+1/120+1/168)*56 上面打错了。。这道才对
(8/1+1/24+1/48+1/80+1/120+1/168)*56 上面打错了。。这道才对
![(8/1+24/1+48/1+80/1+120//1+168/1)*56](/uploads/image/z/769291-43-1.jpg?t=%EF%BC%888%2F1%2B24%2F1%2B48%2F1%2B80%2F1%2B120%2F%2F1%2B168%2F1%EF%BC%89%2A56)
(1/8+1/24+1/48+1/80+1/120+1/168)*56
=[1/(2*4)+1/(4*6)+1/(6*8)+1/(8*10)+1/(10*12)+1/(12*14)]*56
=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)*56
=1/2*(1/2-1/14)*56
=12
=[1/(2*4)+1/(4*6)+1/(6*8)+1/(8*10)+1/(10*12)+1/(12*14)]*56
=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)*56
=1/2*(1/2-1/14)*56
=12
(8/1+24/1+48/1+80/1+120//1+168/1)*56
(1/8+1/24+1/48+1/80+1/120+1/168)*56
(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+1/224)*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)乘64
(8/1+24/1+48/1+80/1+120/1+168/1+224/1+288/1)*128
(1/8+1/24+1/48+1/80+1/120+1/168+1/224+1/228)*128
121 *3/4-3/8*40-0.75 (1/8+1/24+1/48+1/80+1/120+1/168)*56
“(8分之1+24分之1+48分之1+80分之1+120分之1+168分之1)*56”用简便方法计算
(8分之1+24分之1+48分之1+80分之1+120分之1+168分之1)除以56= 用简便计算