1/42+1/56+1/72+1/90= 用简便方法计算.谁先回答对,完整,

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1/42+1/56+1/72+1/90= 用简便方法计算.谁先回答对,完整,
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1/42+1/56+1/72+1/90= 用简便方法计算.谁先回答对,完整,
1/42+1/56+1/72+1/90= 用简便方法计算.
谁先回答对,完整,

1/42+1/56+1/72+1/90= 用简便方法计算.谁先回答对,完整,
1/42+1/56+1/72+1/90
=1/6*1/7+1/7*1/8+1/8*1/9+1/9*1/10
=1/7*(1/6+1/8)+1/9*(1/8+1/10)
=1/7*7/24+1/9*9/40
=1/24+1/40
=1/8*1/3+1/8*1/5
=1/8*8/15
=1/15

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 1/42+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 1/42+1/56+1/72+1/90+1/110 1-1/6+1/42+1/56+1/72+1/90+1/110= 1/12+1/20+1/30+1/42+1/56+1/72+1/90=? 1/42+1/56+1/72+1/90+1/110+1/132=? 1/30+1/42+1/56+1/72+1/90+1/110=? 1/30+1/42+1/56+1/72+1/90=简便计算 1/42+1/56+1/72+1/90+1/110=? 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90== 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90= 1/2+1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=多少 1/6+1/12+1/20+1/30+1/42+1/56+1/72+1/90=?等于多少? 1/20+1/30+1/42+1/56+1/72+1/90+1/110+1/132=?能不能简便运算? 1/30+1/42+1/56+1/72=