（8/1+24/1+48/1+80/1+120/1+168/1+224/1+288/1）*128

来源：学生作业帮助网 编辑：六六作业网 时间：2024/11/27 09:07:23
（8/1+24/1+48/1+80/1+120/1+168/1+224/1+288/1）*128（8/1+24/1+48/1+80/1+120/1+168/1+224/1+288/1）*128（8/1

（8/1+24/1+48/1+80/1+120/1+168/1+224/1+288/1）*128
（8/1+24/1+48/1+80/1+120/1+168/1+224/1+288/1）*128

（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+1/288)×128
=128×(1/8)[1+1/3+1/6+1/10+1/15+1/21+1/28+1/36]
=128×(1/8)[1+2(1/(2×3)+1/(3×4)+1/(4×5)+1/(5×6)+1/(6×7)+1/(7×8)+1/(8×9)]
=128×(1/8)[1+2(1/2-1/3+1/3-1/4+...+1/8-1/9]
=128×(1/8)[1+2(1/2-1/9)]
=128×(1/8)[1+1-2/9]
=128×(1/8)(16/9)
=256/9
第一步提1/8
第二步提2
第三步
1/2-1/3=1/6
1/3-1/4=1/12
1/4-1/5=1/20
1/5-1/6=1/30
1/6-1/7=1/42
1/7-1/8=1/56
1/8-1/9=1/72

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