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\(\frac{1}{4}+\frac{3}{8}+\frac{5}{16}=\frac{5}{8}+\frac{5}{16}=\frac{15}{16}\)
\(\frac{3}{5}-\frac{1}{3}-\frac{1}{6}=\frac{4}{15}-\frac{1}{6}=\frac{1}{10}\)
\(\frac{4}{7}\cdot\frac{5}{8}\cdot\frac{7}{12}=\frac{4.5.7}{7.8.12}=\frac{140}{672}=\frac{5}{24}\)
\(\frac{25}{28}:\frac{15}{14}\cdot\frac{6}{7}=\frac{5}{6}\cdot\frac{6}{7}=\frac{5}{7}\)
\(\frac{1}{4}+\frac{3}{8}+\frac{5}{16}=\frac{15}{16}\)
\(\frac{3}{5}-\frac{1}{3}-\frac{1}{6}=\frac{1}{10}\)
\(\frac{4}{7}\times\frac{5}{8}\times\frac{7}{12}=\frac{5}{24}\)
\(\frac{25}{28}:\frac{15}{14}\times\frac{6}{7}=\frac{5}{7}\)
0 x 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1
= 0 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1
= 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1
= 15 + 6 + 5 + 4 + 3 + 2 + 1
= 21 + 5 + 4 + 3 + 2 + 1
= 26 + 4 + 3 + 2 + 1
= 30 + 3 + 2 + 1
= 33 + 2 + 1
= 35 + 1
= 36
k cho mình nha
kết bạn với mình nha
\(\left[12\cdot15-x\right]\cdot\frac{1}{4}=120\cdot\frac{1}{4}\)
\(\Leftrightarrow\left[180-x\right]\cdot\frac{1}{4}=30\)
\(\Leftrightarrow180-x=30:\frac{1}{4}\)
\(\Leftrightarrow180-x=120\)
\(\Leftrightarrow x=60\)
\(\frac{3}{5}.\frac{4}{7}.1.\frac{1}{2}\)
\(=\frac{3.4.1.1}{5.7.1.2}\)
\(=\frac{12}{70}\)
\(=\frac{12:2}{70:2}=\frac{6}{35}\)
ta có :\(\left(1-\frac{1}{5}\right)x\left(1-\frac{1}{6}\right)x\left(1-\frac{1}{7}\right)x\left(1-\frac{1}{8}\right)\)
\(=\frac{4}{5}x\frac{5}{6}x\frac{6}{7}x\frac{7}{8}=\frac{4}{8}=\frac{1}{2}\)
\(\left(1-\frac{1}{5}\right).\left(1-\frac{1}{6}\right).\left(1-\frac{1}{7}\right).\left(1-\frac{1}{8}\right)\)
\(=\frac{4}{5}.\frac{5}{6}.\frac{6}{7}.\frac{7}{8}\)
\(=\frac{4}{8}\)
\(=\frac{1}{2}\)