Hoàn thành hai tháp số sau:
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\(\frac{{ - 3}}{{34}}\) |
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\(\frac{{ - 9}}{{34}}\) |
\(\frac{3}{{17}}\) |
\(\frac{1}{2}\) |
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\(\frac{7}{{36}}\) |
\(\frac{{ - 8}}{9}\) |
\(\frac{{ - 7}}{{18}}\) |
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Ô trên bằng tổng hai ô ngay dưới nó.
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a |
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\(\frac{{ - 3}}{{34}}\) |
b |
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\(\frac{{ - 9}}{{34}}\) |
\(\frac{3}{{17}}\) |
\(\frac{1}{2}\) |
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Vì \(b = \frac{3}{{17}} + \frac{1}{2} \Leftrightarrow b = \frac{{23}}{{34}}\)
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Vì \(a = \frac{{ - 3}}{{34}} + b \Leftrightarrow a = \frac{{ - 3}}{{34}} + \frac{{23}}{{34}} = \frac{{10}}{{17}}\)
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c |
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d |
e |
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\(\frac{7}{{36}}\) |
\(\frac{{ - 8}}{9}\) |
\(\frac{{ - 7}}{{18}}\) |
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Vì \(d = \frac{7}{{36}} + \frac{{ - 8}}{9} \Leftrightarrow d = \frac{{ - 25}}{{36}}\)
Vì \(e = \frac{{ - 8}}{9} + \frac{{ - 7}}{{18}} \Leftrightarrow e = \frac{{ - 23}}{{18}}\)
Vì \(c = d + e \Leftrightarrow c = \frac{{ - 25}}{{36}} + \frac{{ - 23}}{{18}} = \frac{{ - 71}}{{36}}\)
Vậy
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\(\frac{{10}}{{17}}\) |
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\(\frac{{ - 3}}{{34}}\) |
\(\frac{{23}}{{34}}\) |
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\(\frac{{ - 9}}{{34}}\) |
\(\frac{3}{{17}}\) |
\(\frac{1}{2}\) |
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\(\frac{{ - 71}}{{36}}\) |
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\(\frac{{ - 25}}{{36}}\) |
\(\frac{{ - 23}}{{18}}\) |
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\(\frac{7}{{36}}\) |
\(\frac{{ - 8}}{9}\) |
\(\frac{{ - 7}}{{18}}\) |
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