Đề bài

Hoàn thành hai tháp số sau:

\(\frac{{ - 3}}{{34}}\)
\(\frac{{ - 9}}{{34}}\)	\(\frac{3}{{17}}\)		\(\frac{1}{2}\)

 

\(\frac{7}{{36}}\)	\(\frac{{ - 8}}{9}\)		\(\frac{{ - 7}}{{18}}\)

Lời giải chi tiết

a
\(\frac{{ - 3}}{{34}}\)		b
\(\frac{{ - 9}}{{34}}\)	\(\frac{3}{{17}}\)		\(\frac{1}{2}\)

Vì \(b = \frac{3}{{17}} + \frac{1}{2} \Leftrightarrow b = \frac{{23}}{{34}}\)Vì \(a = \frac{{ - 3}}{{34}} + b \Leftrightarrow a = \frac{{ - 3}}{{34}} + \frac{{23}}{{34}} = \frac{{10}}{{17}}\)

c
d		e
\(\frac{7}{{36}}\)	\(\frac{{ - 8}}{9}\)		\(\frac{{ - 7}}{{18}}\)

    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

\(\frac{{10}}{{17}}\)
\(\frac{{ - 3}}{{34}}\)		\(\frac{{23}}{{34}}\)
\(\frac{{ - 9}}{{34}}\)	\(\frac{3}{{17}}\)		\(\frac{1}{2}\)

\(\frac{{ - 71}}{{36}}\)
\(\frac{{ - 25}}{{36}}\)		\(\frac{{ - 23}}{{18}}\)
\(\frac{7}{{36}}\)	\(\frac{{ - 8}}{9}\)		\(\frac{{ - 7}}{{18}}\)