a,
=1/2x2/3x3/4x...x17/18x18/19x19/20
=1/20
b,
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Các câu hỏi tương tự
Tính:(1-1/2x1/2)x(1-1/3x1/3)x(1-1/4x1/4)x…x(1-1/2007x1/2007)
Tính:
(1-1/2x1/2)x(1-1/3x1/3)x(1-1/4x1/4)x…x(1-1/2007x1/2007)
a)\(\left(1-\frac{1}{2}\right)x\left(1-\frac{1}{3}\right)x\left(1-\frac{1}{4}\right)x\left(1-\frac{1}{5}\right)x......x\left(1-\frac{1}{18}\right)x\left(1-\frac{1}{19}\right)x\left(1-\frac{1}{20}\right)\)
b)\(1\frac{1}{2}x1\frac{1}{3}x1\frac{1}{4}x1\frac{1}{5}x......x1\frac{1}{2005}x1\frac{1}{2006}x1\frac{1}{2007}\)
Tính bằng cách nhanh nhất :
a. ( 1-1/2 ) x ( 1 -1/3) x ( 1-1/4) x.... x ( 1-18)x ( 1-1/19 ) x ( 1 - 1/20 )
b. 3/2 x 4/3 x 5/4 x ..... x 2006/2005 x 2007/2006 x 2008/2007
giải hộ mih nhé
1/1x1/2+1/2x1/3+1/3x1/4+1/4x1/5+1/5x1/6
Tính;
a) (1-1/2) x ( 1-1/3) x ( 1-1/4 ) x ( 1-1/19) x ( 1-1/20)
b) 1 1/2 x 1 1/3 x 1 1/4 x 1 1/5 x 1 1/2005 x 1 1/2006 x 1 1/2007(hỗn số hết nhé)
GIải hộ mình vs nhé
{1-1/2}x{1-1/3}x{1-1/4}x....x{1-1/18}x{1-1/19}x{1-1/20} = ?
a, 1/2 x 1/3 + 1/3x1/4 +1/4 x 1/5 + 1/5 x 1/6 + 1/6 x 1/7 + 1/7 x 1/8 + 1/8 x 1/9 = ?
(1-1/2) x (1-1/3) x (1 -1/4) x ... x (1-1/18) x (1-1/19) x ( 1-1/20)