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a) = 1/2 - 1/2 + 1/3 -1/3 + 1/4 - 1/4 + 1/5 - 1/5 + 1/6
= 0 + 0 + 0 + 0 + 1/6
= 1/6
b) 2/3 + 2/4 - 2/4 + 2/5 - 2/5 + 2/6 - 2/6 + 2/7 - 2/7 + 28
= 2/3 + 28
= 86/3
[tick cho mik nha]
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1) 1/3 x 1/2 x 3/7 = 1/6 x 3/7 = 1/14
2) 5/4 x 1/3 + 1/7 = 5/12 + 1/7 = 47/84
3) 8 x (8/9 - 2/3) = 8 x 2/9 = 16/9
4) 5/6 x 48/20 x 1/2 = 2 x 1/2 = 1
5) (2/5 + 3/4) x 8 = 23/20 x 8 = 46/5
6) 10 x (1/2 - 1/5) = 10 x 3/10 = 3
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3/5 + 4/5 * 2/5 = 3/5 + 8/25 = 15/25 + 8/25 = 23/25
9/16 * 4/3 + 1/2 : 3/4 = 3/4 + 2/3 = 9/12 + 8/12 = 17/12
1/2 * 1/4 * 1/6 = 1/8 * 1/6 =1/48
1/4 : 1/3 - 4/2 = 1/4 : 1/3 - 2 = 3/4 -2 = 3/4 - 4/4 = -1/4
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ban ko tra loi ho minh cau nay a
neu the minh ket ban kieu gi
\(\left(\dfrac{1}{2}-\dfrac{1}{3}+\dfrac{1}{4}-\dfrac{1}{5}\right):\left(\dfrac{1}{4}-\dfrac{1}{5}\right)\)
\(=\left[\left(\dfrac{1}{2}-\dfrac{1}{3}\right)+\left(\dfrac{1}{4}-\dfrac{1}{5}\right)\right]:\left(\dfrac{1}{4}-\dfrac{1}{5}\right)\)
\(=\left(\dfrac{1}{2}-\dfrac{1}{3}\right):\left(\dfrac{1}{4}-\dfrac{1}{5}\right)+\left(\dfrac{1}{4}-\dfrac{1}{5}\right):\left(\dfrac{1}{4}-\dfrac{1}{5}\right)\)
\(=\dfrac{1}{6}:\dfrac{1}{20}+1\)
\(=\dfrac{10}{3}+1\)
\(=\dfrac{13}{3}\)