(8/1+24/1+48/1+80/1+120//1+168/1)*56
来源:学生作业帮 编辑:作业帮 分类:数学作业 时间:2024/05/12 17:23:09
(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
(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