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2020/2019 x 2019/2018 x 2018/2017 x....................3/2
= 2020/2
= 1010
\(2\dfrac{3}{4}=\dfrac{2\times4+3}{4}=\dfrac{11}{4}\\ 3\dfrac{4}{5}=\dfrac{3\times5+4}{5}=\dfrac{19}{5}\\ 4\dfrac{3}{5}=\dfrac{4\times5+3}{5}=\dfrac{23}{5}\\ 11\dfrac{12}{13}=\dfrac{11\times13+12}{13}=\dfrac{155}{13}\\ 12\dfrac{11}{13}=\dfrac{12\times13+11}{13}=\dfrac{167}{13}\\ 3\dfrac{3}{5}=\dfrac{3\times5+3}{5}=\dfrac{18}{5}\)
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\(\dfrac{3}{5}\)=\(\dfrac{18}{5}\).
\(2\dfrac{2}{3}=\dfrac{2\times3+2}{3}=\dfrac{8}{3}\)
\(3\dfrac{2}{1}=\dfrac{3\times1+2}{1}=\dfrac{5}{1}\)
\(\dfrac{8}{3}:\dfrac{5}{1}=\dfrac{8}{3}\times\dfrac{1}{5}=\dfrac{8}{15}\)
Chuyển hỗn số thành phân số :
\(2\dfrac{2}{3}=\dfrac{2x3+2}{3}=\dfrac{8}{3}\)
\(3\dfrac{2}{1}=\dfrac{3x1+2}{3}=\dfrac{5}{3}\)
Vậy nên :
\(2\dfrac{2}{3}:3\dfrac{2}{1}=\dfrac{8}{3}:\dfrac{5}{3}=\dfrac{8}{3}x\dfrac{3}{5}=\dfrac{24}{15}=\dfrac{8}{5}\)
4\(\dfrac{1}{2}\)=4,5 3\(\dfrac{4}{5}\)=3,8 2\(\dfrac{3}{4}\)=2,75 1\(\dfrac{12}{25}\)=1,48.
4 1/2=4,5
3 4/5=3,8
2 3/4=2,75
1 12/25=1,48
đúng 100% nha
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
\(1\dfrac{4}{35}+3\dfrac{4}{7}\times3\dfrac{1}{5}=\dfrac{39}{35}+\dfrac{25}{7}\times\dfrac{16}{5}=\dfrac{39}{35}+\dfrac{80}{7}=\dfrac{39}{35}+\dfrac{400}{35}=\dfrac{39+400}{35}=\dfrac{439}{35}\)
7/3/8 - 4/5/8 = 59/8 - 37/8 = 12
2/1/4 +5/1/4 = 9/4 + 21/4 = 15/2
3/1/4 x 2/3/5 = 13/4 x 13/5 =11/20
\(7\frac{3}{8}-4\frac{5}{8}=\frac{59}{8}-\frac{37}{8}=\frac{22}{8}\)\(=\)\(2,75\)
\(2\frac{1}{4}+5\frac{1}{4}=\frac{9}{4}+\frac{21}{4}=\frac{30}{4}=7,5\)
\(3\frac{1}{4}\times2\frac{3}{5}=\frac{13}{4}\times\frac{13}{5}=\frac{169}{20}=8,45\)
#Minyun
\(\dfrac{54}{10}=5,4\)
\(4\dfrac{78}{1000}=4+\dfrac{78}{1000}=4+0,078=4,078\)
\(18\dfrac{4}{100}=18+\dfrac{4}{100}=18+0,04=18,04\)
\(\dfrac{1990}{10000}=\dfrac{199}{1000}=0,199\)
\(\dfrac{54}{10}=\dfrac{27}{5}=5,4\)
\(4\dfrac{78}{1000}=\dfrac{39}{125}=0,312\)
\(18\dfrac{4}{100}=\dfrac{18}{25}=0,72\)
\(\dfrac{1990}{10000}=\dfrac{199}{1000}=0,199\)
1\(\dfrac{1}{3}\) \(\times\) 5\(\dfrac{1}{5}\): 7\(\dfrac{1}{3}\)
= \(\dfrac{4}{3}\)\(\times\)\(\dfrac{26}{5}\):\(\dfrac{22}{3}\)
= \(\dfrac{4}{3}\) \(\times\) \(\dfrac{26}{5}\) \(\times\) \(\dfrac{3}{22}\)
= \(\dfrac{52}{55}\)
\(1\dfrac{1}{5}+1\dfrac{2}{4}=\dfrac{6}{5}+\dfrac{6}{4}=\dfrac{24}{20}+\dfrac{30}{20}=\dfrac{54}{40}\)
Cách chuyển hỗn số thành phân số :
\(1\dfrac{1}{5}=\dfrac{1x5+1}{5}=\dfrac{6}{5}\)
\(1\dfrac{2}{4}=\dfrac{1x4+2}{4}\dfrac{6}{4}\)