(1/42)+(1/56)+(1/72)+(1/90)+(1/100) 求简便方法,亲,过程是关键,求简便过程.

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(1/42)+(1/56)+(1/72)+(1/90)+(1/100) 求简便方法,亲,过程是关键,求简便过程.

(1/42)+(1/56)+(1/72)+(1/90)+(1/100) 求简便方法,亲,过程是关键,求简便过程.
(1/42)+(1/56)+(1/72)+(1/90)+(1/100) 求简便方法,
亲,过程是关键,求简便过程.

(1/42)+(1/56)+(1/72)+(1/90)+(1/100) 求简便方法,亲,过程是关键,求简便过程.
(1/42)+(1/56)+(1/72)+(1/90)+(1/100)
=1/6-1/7+1/7-1/8+1/8-1/9+1/9-1/10+1/100
=1/6-1/10+1/100
=1/15+1/100
=23/300

1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72+1/90 1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72+1/90 1－1/6 +1/42 +1/56 +1/72 1-1/6＋1/42+1/56+1/72 1/42+1/56+1/72+1/90+1/110 1/30+1/42+1/56+1/72 简算 1/30+1/42+1/56+1/72简便算法 1/30+1/42+1/56+1/72＝ 简算1/30+1/42+1/56+1/72＝? 1/30+1/42+1/56+1/72= 30分之1+42分之一+56分之1+72分之一 42/1 + 56/1 +72/1 + 90/1 + 110/1 + 132/1=?错了，是1/42+1/56+1/72+1/90+1/110+1/132 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72 1/12+1/20+1/30+1/42+1/56+1/72+1/90 1/12+1/20+1/30+1/42+1/56+1/72+1/90