-0-1238921

   1\(\dfrac{1}{3}\) \(\times\) 5\(\dfrac{1}{5}\): 7\(\dfrac{1}{3}\)

=  \(\dfrac{4}{3}\)\(\times\)\(\dfrac{26}{5}\):\(\dfrac{22}{3}\)

=  \(\dfrac{4}{3}\) \(\times\) \(\dfrac{26}{5}\) \(\times\) \(\dfrac{3}{22}\)

= \(\dfrac{52}{55}\)

1 4/35 + 3 4/7 * 3 1/5 = 39/35 + 25/7 * 16/5 = 39/35 +  80/7 = 39/35 + 400/35 = 439/35

\(1\dfrac{4}{35}+3\dfrac{4}{7}\times3\dfrac{1}{5}=\dfrac{39}{35}+\dfrac{25}{7}\times\dfrac{16}{5}=\dfrac{39}{35}+\dfrac{80}{7}=\dfrac{39}{35}+\dfrac{400}{35}=\dfrac{39+400}{35}=\dfrac{439}{35}\)

C

XLNHA MIK HOK BT

\(2\dfrac{3}{4}=\dfrac{2\times4+3}{4}=\dfrac{11}{4}\\ 3\dfrac{4}{5}=\dfrac{3\times5+4}{5}=\dfrac{19}{5}\\ 4\dfrac{3}{5}=\dfrac{4\times5+3}{5}=\dfrac{23}{5}\\ 11\dfrac{12}{13}=\dfrac{11\times13+12}{13}=\dfrac{155}{13}\\ 12\dfrac{11}{13}=\dfrac{12\times13+11}{13}=\dfrac{167}{13}\\ 3\dfrac{3}{5}=\dfrac{3\times5+3}{5}=\dfrac{18}{5}\)

2\(\dfrac{3}{4}\)=\(\dfrac{11}{4}\)

3\(\dfrac{4}{5}\)=\(\dfrac{19}{5}\)

4\(\dfrac{3}{5}\)=\(\dfrac{23}{5}\)

11\(\dfrac{12}{13}\)=\(\dfrac{155}{13}\)

12\(\dfrac{11}{13}\)=\(\dfrac{167}{13}\)

3\(\dfrac{3}{5}\)=\(\dfrac{18}{5}\).

\(3\dfrac{5}{10}=\dfrac{35}{10}=\dfrac{7}{2}=3,5\)

\(12\dfrac{5}{100}=\dfrac{241}{20}=12,05\)

\(17\dfrac{23}{100}=\dfrac{1723}{100}=17,23\)

\(10\dfrac{7}{10}=\dfrac{107}{10}=10,7\)

3\(\dfrac{5}{10}\)=3,5;12\(\dfrac{5}{100}\)=12,05;17\(\dfrac{23}{100}\)=17,23;10\(\dfrac{7}{10}\)=10,7.

b và c

1-b,2-c

 \(12\frac{3}{5}=\frac{63}{5}=12,6\)

12.6 kết bạn với mình nhé .