rút gọn phân số 30/85,49/77
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\(\dfrac{30}{100}=\dfrac{30:10}{100:10}=\dfrac{3}{10}\)
\(\dfrac{55}{77}=\dfrac{55:11}{77:11}=\dfrac{5}{7}\)
\(\dfrac{234}{765}=\dfrac{234:9}{765:9}=\dfrac{26}{85}\)
\(\dfrac{8}{10000}=\dfrac{8:8}{10000:8}=\dfrac{1}{1250}\)
a: Phân số tối giản là 25/27; 77/79
b: 51/34=3/2
77/99=7/9
120/201=40/67
351/621=13/23
a,\(\dfrac{44}{77}=\dfrac{44:11}{77:11}=\dfrac{4}{7}\)
b\(\dfrac{72}{90}=\dfrac{72:9}{90:9}=\dfrac{8}{9}\)
a) Phân số đã cho chưa tối giản
\(\dfrac{27}{123}=\dfrac{9\cdot3}{41\cdot3}=\dfrac{9}{41}\)
b) Phân số đã cho chưa tối giản
\(\dfrac{33}{77}=\dfrac{3\cdot11}{7\cdot11}=\dfrac{3}{7}\)
\(a,\\ =\dfrac{5}{4}-\dfrac{3}{4}=\dfrac{2}{4}=\dfrac{1}{2}\\ b,\\ =\dfrac{2}{3}-\dfrac{2}{5}=\dfrac{10-6}{15}=\dfrac{4}{15}\\ c,\\ =\dfrac{5}{6}-\dfrac{1}{4}=\dfrac{20-6}{24}=\dfrac{14}{24}=\dfrac{7}{12}\\ d,\\ =\dfrac{4}{3}-\dfrac{1}{4}=\dfrac{12-3}{12}=\dfrac{9}{12}=\dfrac{3}{4}\)
\(\frac{77}{176}=\frac{77:11}{176:11}=\frac{7}{16}\) ; \(\frac{232323}{474747}=\frac{232323:10101}{474747:10101}=\frac{23}{47}\)
\(\frac{376376}{159159}=\frac{376376:1001}{159159:1001}=\frac{376}{159}\) ; \(\frac{9\cdot8\cdot5}{24\cdot15}=\frac{9\cdot8\cdot5}{8\cdot3\cdot3\cdot5}=\frac{9\cdot8\cdot5}{8\cdot9\cdot5}=1\)
\(\frac{9.8.5}{24.15}\)
\(=\frac{9.8.5}{8.3.3.5}\)
\(=1\)
30/85 = 6/17
49/77 = 7/11
\(\dfrac{30}{85}\) = \(\dfrac{30:5}{85:5}\) = \(\dfrac{6}{17}\)
\(\dfrac{49}{77}\) = \(\dfrac{49:7}{77:7}\) = \(\dfrac{7}{11}\)