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\(\dfrac{5}{7}\)>\(\dfrac{6}{21}\)
\(\dfrac{18}{24}\)>\(\dfrac{15}{25}\)
\(\dfrac{12}{13}\)=\(\dfrac{1212}{1313}\)
1. \(\frac{12}{18}\)= \(\frac{2}{3}\)
\(\frac{22}{33}\)= \(\frac{2}{3}\)
\(\frac{1010}{1313}\)= \(\frac{10}{13}\)
\(\frac{27}{36}\)= \(\frac{3}{4}\)
\(\frac{202}{303}\)= \(\frac{2}{3}\)
\(\frac{1111}{1212}\)= \(\frac{11}{12}\)
2. a) 12 x \(\frac{1313}{13}\)x 1212
= 12 x \(\frac{13}{13}\)x 1212
1. \(\frac{12}{18}=\frac{2}{3}\): \(\frac{22}{33}=\frac{2}{3}\); \(\frac{1010}{1313}=\frac{10}{13}\); \(\frac{27}{36}=\frac{3}{4}\) ; \(\frac{202}{303}=\frac{2}{3}\);\(\frac{1111}{1212}=\frac{11}{12}\)
2 a)\(\frac{12X1313}{13X1212}=\frac{12X13X101}{13X12X101}=1\);b) \(\frac{1111X121212}{1212X111111}=\frac{11X101X12X10101}{12X101X11X10101}=1\)
a) \(\frac{33}{55}=\frac{33:11}{55:11}=\frac{3}{5}\)
Vì \(\frac{3}{5}=\frac{3}{5}\)nên \(\frac{3}{5}=\frac{33}{55}\)
\(\frac{20}{28}=\frac{20:4}{28:4}=\frac{5}{7}\)
Vì \(\frac{5}{7}=\frac{5}{7}\)nên \(\frac{5}{7}=\frac{20}{28}\)
b) \(\frac{6}{21}=\frac{6:3}{21:3}=\frac{2}{7}\)
Vì \(\frac{5}{7}>\frac{2}{7}\)nên \(\frac{5}{7}>\frac{6}{21}\)
\(\frac{1212}{1313}=\frac{1212:101}{1313:101}=\frac{12}{13}\)
VÌ \(\frac{12}{13}=\frac{12}{13}\)nên \(\frac{12}{13}=\frac{1212}{1313}\)
a) Rút gọn 33/55=3/5 => 3/5 = 3/5 hay 3/5=20/28
b) rút gọn 20/28= 5/7=> 5/7= 5/7 hay 5/7 = 20/28
c) rút gọn 6/21 = 2/7=> 5/7 >2/7 hay 5/7>6/21
d) rút gọn 1212/1313 = 12/13=> 12/13=12/13 hay 12/13=1212/1313
\(a,\)Ta có : \(\frac{33}{55}=\frac{33:11}{55:11}=\frac{3}{5}\)
\(\Rightarrow\frac{3}{5}=\frac{33}{55}\)
\(b,\)Ta có : \(\frac{1212}{1313}=\frac{1212:101}{1313:101}=\frac{12}{13}\)
\(\Rightarrow\frac{12}{13}=\frac{1212}{1313}\)
\(c,\)Ta có : \(\frac{20}{28}=\frac{20:4}{28:4}=\frac{5}{7}\)
\(\Rightarrow\frac{5}{7}=\frac{20}{28}\)
\(d,\)Ta có : \(\frac{6}{21}=\frac{6:3}{21:3}=\frac{2}{7}\)
Vì \(\frac{5}{7}>\frac{2}{7}\Rightarrow\frac{5}{7}>\frac{6}{21}\)
\(\frac{1313}{1818}\)= \(\frac{1313:101}{1818:101}\)=\(\frac{13}{18}\)
1212/1313=1212:101/1313:101=12/13
1212/1313=1212:101/1313:101=12/13