=1+1/3-1/4+1/4-1/5+1/5-1/6
=4/3-1/6=7/6
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tính nhanh
1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7
1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7 + 1/20x21
Tính nhanh:
1+1/3x4+1/4x5+1/5x6
1/1x2 + 1/2x3 +1/3x4 +1/4x5 +1/5x6
1/3x4 + 1/4x5 + 1/5x6 + ...........+ 1/11x12
1\2x3+1\3x4+1\4x5+1\5x6
1/3x4 + 1/4x5 + 1/5x6 + .........+ 1/11x12 =
1/3x4 + 1/4x5 + 1/5x6 + ... + 1/2009+2010
A = 1/2x3 + 1/3x4 + 1/4x5 + 1/5x6 + 1/6x7 + 1/7x8
tính 1/3x4+1/4x5+1/5x6+............+1/11x12= ?