tính tổng
1/2 + 1/4 + 1/8
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\(\frac{16\times8-16\times2}{12\times4}\)
\(=\frac{16\times\left(8-2\right)}{12\times4}\)
\(=\frac{16\times6}{12\times4}\)
\(=2\)
#H
\(\frac{14}{15}:\frac{7}{5}\)
\(=\frac{14\times5}{15\times7}\)
\(=\frac{2}{3}\)
#H
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\(\frac{12.4+12.6}{24}\)
\(\Leftrightarrow\frac{12.\left(4+6\right)}{24}\)
\(\Leftrightarrow\frac{12.10}{24}\)
\(\Leftrightarrow5\)
\(.\)là dấu nhân nhé .
\(\frac{1}{2}+\frac{1}{4}+\frac{1}{8}\)
\(=\frac{4}{8}+\frac{2}{8}+\frac{1}{8}\)
\(=\frac{4+2+1}{8}\)
\(=\frac{7}{8}\)
1/2 + 1/4 + 1/8
= 4/8 + 2/8 + 1/8
=6/8 + 1/8
= 7/8