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\(2\times\frac{2}{4}\div\frac{4}{5}\)
\(\Rightarrow\frac{2}{1}\times\frac{2}{4}\div\frac{4}{5}\)
\(\Rightarrow\frac{4}{4}\div\frac{4}{5}\)
\(\Rightarrow\frac{4}{4}\times\frac{5}{4}\)
\(\Rightarrow\frac{5}{4}\)
1/2 + 4/3 = 3/6 + 8/6 = 11/6
4/5 + 3/4 : 2/3 = 4/5 + 3/4 * 3/2 = 4/5 + 9/8 = 32/40 + 45/40 = 77/40
7/2 - 4/3 * 1/6 = 7/2 - 2/9 = 63/18 - 4/18 = 59/18
4/5 * 4/7 : 2/3 = 16/35 : 2/3 = 16/35 * 3/2 = 24/35
1/4 : 5/3 + 1/6 = 1/4 * 3/5 + 1/6 = 3/20 + 1/6 = 9/60 + 10/60 = 19/60
3 - 4/5 : 1/3 = 3 - 4/5 * 3/1 = 3 - 12/5 = 15/5 - 12/5 = 3/5
5/9 * 2/7 - 3/7 = 10/63 - 3/7 = 10/63 - 27/63 = -17/63
1.
= 10 000 - 29 x 11
= 10 000 - 319
= 9681
2.
= ( 3/7 + 4/7 ) + ( 4/9 + 5/9 )
= 1 + 1
= 2
a) \(\frac{2}{7}\div\frac{2}{3}-\frac{1}{7}\)
\(=\frac{2}{7}\times\frac{3}{2}-\frac{1}{7}\)
\(=\frac{2\times3}{7\times2}\)
\(=\frac{3}{7}-\frac{1}{7}\)
\(=\frac{2}{7}\)
b) \(\frac{2}{5}\times\frac{4}{3}\div\frac{2}{3}\)
\(=\frac{2}{5}\times\frac{4}{3}\times\frac{3}{2}\)
\(=\frac{2\times4\times3}{5\times3\times2}\)
\(=\frac{4}{5}\)
A) \(\frac{4}{5}+\frac{5}{4}-2=\frac{16}{20}+\frac{25}{20}-\frac{40}{20}\)
\(=\frac{1}{20}\)
B) \(3-\frac{2}{3}-\frac{3}{2}=\frac{18}{6}-\frac{4}{6}-\frac{9}{6}\)
\(=\frac{5}{6}\)
C) \(\frac{7}{8}-\left(\frac{1}{4}+\frac{2}{5}\right)=\frac{7}{8}-\frac{13}{20}\)
\(=\frac{35}{40}-\frac{26}{40}=\frac{9}{40}\)
D) \(\frac{9}{10}-\left(\frac{2}{5}+\frac{3}{10}\right)+\frac{7}{10}=\frac{9}{10}-\frac{7}{10}+\frac{7}{10}\)
\(=\frac{9}{10}\)
\(\frac{2}{5}-\frac{1}{7}+\frac{3}{5}.\frac{1}{3}=\frac{14}{35}-\frac{5}{35}+\frac{7}{35}=\frac{16}{35}\)
\(\frac{2}{5}-\frac{1}{7}+\frac{3}{5}\times\frac{1}{3}\)
\(=\frac{2}{5}-\frac{1}{7}+\frac{1}{5}\)
\(=\frac{9}{35}+\frac{1}{5}\)
\(=\frac{16}{35}\)
2/3 x X = 1/4 X x 1/5 = 1/2 X : 7/8 = 2/3
X = 1/4 : 2/3 X = 1/2 : 1/5 X = 2/3 x 7/8
X = 3/8 X = 5/2 X = 7/12
chúc bạn học tôt
4/7 *1/3+5/7:2/3
\(\frac{4}{21}\)+ \(\frac{15}{14}\)= \(\frac{53}{42}\)
=4/21+15/14
=53/42