中国能源工程公司:6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103
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A.433/567 B.532/653 C.522/721 D. 436/673
C
6/1*7-6/7*13-6/13*19-6/19*25-…-6/97*103
=(1-1/7)-(1/7-1/13)-(1/13-1/19)-(1/19-1/25)…-(1/97-1/103)
=1-1/7-1/7+1/13-1/13+1/19-1/19+1/25…-1/97+1/103
=1-2/7+1/103
=721/721-206/721+7/721
=522/721
1/(2/3)/(3/4)/(4/5)/(5/6)/(6/7)/(7/8)
网球比分6-7(4)/6-7(11)/6-2/6-1/7-6(3)中的括号的数字怎么理解
6/1*7 - 6/7*13 - 6/13*19 - 6/19*25-…-6/97*103
1/5×1/6+1/6×1/7+1/7×1/8+1/8×1/9+1/9×1/10的简便方法是什么?
1/2+1/3+1/4+1/5+1/6+1/7+.......+1/99+1/100=?
1/2+1/3+1/4+1/5+1/6+1/7+...+1/n
1/2+3/4+5/6+7/8+9/10+``````+99/100=?
71 1/6×6/7+61 1/5×5/6+51 1/4×4/5+41 1/3×3/4+31 1/2×3/2
1 8 9 4 1 1/6的排列规律、0 3/2 2/3 5/4 4/5 7/6
(x+1/x+2)-(1/x+7)=(x+2/x+3)-(1/x+6)