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\(2\dfrac{3}{4}=\dfrac{2\times4+3}{4}=\dfrac{11}{4}\\ 3\dfrac{4}{5}=\dfrac{3\times5+4}{5}=\dfrac{19}{5}\\ 4\dfrac{3}{5}=\dfrac{4\times5+3}{5}=\dfrac{23}{5}\\ 11\dfrac{12}{13}=\dfrac{11\times13+12}{13}=\dfrac{155}{13}\\ 12\dfrac{11}{13}=\dfrac{12\times13+11}{13}=\dfrac{167}{13}\\ 3\dfrac{3}{5}=\dfrac{3\times5+3}{5}=\dfrac{18}{5}\)
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\(\dfrac{3}{5}\)=\(\dfrac{18}{5}\).
\(1\dfrac{1}{5}+1\dfrac{2}{4}=\dfrac{6}{5}+\dfrac{6}{4}=\dfrac{24}{20}+\dfrac{30}{20}=\dfrac{54}{40}\)
Cách chuyển hỗn số thành phân số :
\(1\dfrac{1}{5}=\dfrac{1x5+1}{5}=\dfrac{6}{5}\)
\(1\dfrac{2}{4}=\dfrac{1x4+2}{4}\dfrac{6}{4}\)
2020/2019 x 2019/2018 x 2018/2017 x....................3/2
= 2020/2
= 1010
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
\(4\frac{2}{3}+2\frac{3}{4}.7\frac{3}{11}=\frac{14}{3}+\frac{11}{4}.\frac{80}{11}=\frac{14}{3}+20=\frac{14}{3}+\frac{60}{3}=\frac{74}{3}\)
\(4\frac{2}{3}+2\frac{3}{4}\times7\frac{3}{11}\)
\(=\frac{14}{3}+\frac{11}{4}\times\frac{80}{11}\)
\(=\frac{14}{3}+\frac{11\times80}{4\times11}\)
\(=\frac{14}{3}+20\)
\(=\frac{14}{3}+\frac{60}{3}\)
\(=\frac{74}{3}\)
\(3\frac{1}{2}\) = \(3\cdot2+1\) = \(7\) ; Mẫu số giữ nguyên
Vậy ta được phân số \(\frac{7}{2}\)
Đáp số : \(\frac{7}{2}\)
\(3\frac{2}{5}=\frac{3\cdot5+2}{5}=\frac{17}{5}\)
\(2\frac{1}{7}=\frac{2\cdot7+1}{7}=\frac{15}{7}\)
\(8\frac{1}{6}=\frac{8\cdot6+1}{6}=\frac{49}{6}\)
\(2\frac{1}{2}=\frac{2\cdot2+1}{2}=\frac{5}{2}\)
\(3\frac{2}{5}\cdot2\frac{1}{7}=\frac{17}{5}\cdot\frac{15}{7}=\frac{51}{7}\)
\(8\frac{1}{6}:2\frac{1}{2}=\frac{49}{6}:\frac{5}{2}=\frac{49}{6}\cdot\frac{2}{5}=\frac{49}{15}\)
\(\left(a\right)3\frac{2}{4}=3x4+2=\frac{14}{4}\)
\(\left(b\right)5\frac{3}{2}=5x3+2=\frac{17}{2}\)
\(2\dfrac{2}{3}=\dfrac{2\times3+2}{3}=\dfrac{8}{3}\)
\(3\dfrac{2}{1}=\dfrac{3\times1+2}{1}=\dfrac{5}{1}\)
\(\dfrac{8}{3}:\dfrac{5}{1}=\dfrac{8}{3}\times\dfrac{1}{5}=\dfrac{8}{15}\)
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 :
\(2\dfrac{2}{3}:3\dfrac{2}{1}=\dfrac{8}{3}:\dfrac{5}{3}=\dfrac{8}{3}x\dfrac{3}{5}=\dfrac{24}{15}=\dfrac{8}{5}\)