65,80,103,120,149,168()
(8/1+24/1+48/1+80/1+120//1+168/1)*42
(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+224/1+288/1)*128
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+1/228)*128
42*(8分之1+24分之1+48分之1+80分之1+120分之1+168分之1)
“(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
121 *3/4-3/8*40-0.75 (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+1/224+1/228)*128 第二题:2005个9*
(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