1/4×5+1/5×6+1/6×7+1/7×8=
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1/4×5+1/5×6+1/6×7+1/7×8=1/4×5+1/5×6+1/6×7+1/7×8=1/4×5+1/5×6+1/6×7+1/7×8=1/4×5+1/5×6+1/6×7+1/7×8=1/4-
1/4×5+1/5×6+1/6×7+1/7×8=
1/4×5+1/5×6+1/6×7+1/7×8=
1/4×5+1/5×6+1/6×7+1/7×8=
1/4×5+1/5×6+1/6×7+1/7×8
=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/4-1/8
=1/8
1/4*5=1/4-1/5
1/5*6=1/5-1/6
所以上式化为1/4-1/8=1/8
=5/4+6/5+7/6+8/7=4.759
出的有歧义啊 像1/4*5是1除以20的意思 还是1/4在乘以5的意思呢 不严谨
4(319/420)
1/n*(n+1)=1/n-1/(n+1)
所以1/4×5+1/5×6+1/6×7+1/7×8
=1/4-1/5+1/5-1/6+1/6-1/7+1/7-1/8
=1/4-1/8
=1/8
1,4,5,6,7,
(1/4+1/5+1/6+1/7)的平方-（1/4+1/5+1/6+1/7)乘(1/5+1/6+1/7)等于?
1/3*4+1/4*5+1/5*6+1/6*7+.1/99*100=?
1/4×5+1/5×6+1/6×7+1/7×8=
（简单运算）(4+1/5+1/6+1/7)*(1/5+1/6+1/7+1/8)-(4+1/5+1/6+1/7+1/8)*(1/5+1/6+1/7)星号是乘号
1/5-1/6 7/8-1/4
6x+7/5=5x+1/4 +1
1,4,5,6,7题.
1、2、3、4、5、6、7
1,2,3,4,5,6,7,
1,2 ,3,4,5,6,7
1+2-3+4-5+6-7
1+2+3+4+5+6+7
1,2,3,4,5,6,7
1+2+3+4+6+7+5
1、2、3、4、5、6、7
1,2,3,4,5,6,7
1×2×3×4×5×6×7