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\(\dfrac{15}{25}=\dfrac{15:5}{25:5}=\dfrac{3}{5}\\ \dfrac{24}{28}=\dfrac{24:4}{28:4}=\dfrac{6}{7}\\ \dfrac{18}{33}=\dfrac{18:3}{33:3}=\dfrac{6}{11}\\ \dfrac{12}{36}=\dfrac{12:12}{36:12}=\dfrac{1}{3}.\)
\(\dfrac{1313}{1515}=\dfrac{1313:101}{1515:101}=\dfrac{13}{15}\)
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\(\dfrac{176}{187}=\dfrac{176:11}{187:11}=\dfrac{16}{17}\)
\(\dfrac{1313}{1515}=\dfrac{1313:101}{1515:101}=\dfrac{13}{15}\)
\(\dfrac{176}{187}=\dfrac{176:11}{187:11}=\dfrac{16}{17}\)
a) \(\dfrac{8}{16}=\dfrac{8:8}{16:8}=\dfrac{1}{2}\)
b) \(\dfrac{10}{30}=\dfrac{10:10}{30:10}=\dfrac{1}{3}\)
c) \(\dfrac{24}{18}=\dfrac{24:6}{18:6}=\dfrac{4}{3}\)
d) \(\dfrac{20}{28}=\dfrac{20:4}{28:4}=\dfrac{5}{7}\)
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) \(\dfrac{16}{15}+\dfrac{7}{15}+\dfrac{4}{15}=\left(\dfrac{16}{15}+\dfrac{4}{15}\right)+\dfrac{7}{15}=\dfrac{20}{15}+\dfrac{7}{15}=\dfrac{27}{15}\)
b) \(\dfrac{5}{17}+\dfrac{7}{17}+\dfrac{13}{17}=\dfrac{5}{17}+\left(\dfrac{7}{17}+\dfrac{13}{17}\right)=\dfrac{5}{17}+\dfrac{20}{17}=\dfrac{25}{17}\)
\(a,\dfrac{5}{13}\times\dfrac{4}{15}\times13=\dfrac{5\times4\times13}{13\times5\times3}=\dfrac{4}{3}\\ b,\left(\dfrac{3}{7}+\dfrac{5}{2}\right)\times\dfrac{7}{5}=\dfrac{3}{7}\times\dfrac{7}{5}+\dfrac{5}{2}\times\dfrac{7}{5}=\dfrac{3}{5}+\dfrac{7}{2}=\dfrac{6}{10}+\dfrac{35}{10}=\dfrac{41}{10}\\ c,\dfrac{1}{5}\times\dfrac{11}{18}+\dfrac{11}{18}\times\dfrac{3}{5}=\dfrac{11}{18}\times\left(\dfrac{1}{5}+\dfrac{3}{5}\right)=\dfrac{11}{18}\times\dfrac{4}{5}=\dfrac{22}{45}\)
\(\dfrac{5}{7}\)>\(\dfrac{6}{21}\)
\(\dfrac{18}{24}\)>\(\dfrac{15}{25}\)
\(\dfrac{12}{13}\)=\(\dfrac{1212}{1313}\)
1.
=2/5 x 12/3 + 2/5 x 15/3 + 2/5 x 1
= 2/5 x (12/3 + 15/3 + 1)
=2/5 x 1
=2/5
2.a=1;2
a, 12/15 = 4/5
18/24 = 3/4
16/28 = 4/7
1212/1515 = 4/5
b, 1212 x 131313 / 1313 x 121212
= 12 x 101 x 13 x 10101 / 13 x 101 x 12 x 10101
= 1 ( sử dụng cách triệt tiêu )
\(\dfrac{12}{15}=\dfrac{4}{5};\dfrac{18}{24}=\dfrac{3}{4}\)