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a: 5/14=10/28
-3/7=-12/28
-3/4=-21/28
b: 4/11=40/110
-3/5=-66/110
-1/-2=1/2=55/110
c: 7/15=56/120
-3/8=-45/120
-2/3=-80/120
a, \(\frac{5}{6};\frac{11}{12}\)
Giữ nguyên phân số \(\frac{11}{12}\)
Quy đồng: \(\frac{5}{6}=\frac{5\cdot2}{6\cdot2}=\frac{10}{12}\)
b, \(\frac{3}{5};-2\)
Giữ nguyên phân số \(\frac{3}{5}\)
Quy đồng: \(-2=\frac{-2\cdot5}{5}=-\frac{10}{5}\)
c, \(-\frac{1}{4};\frac{3}{8};\frac{7}{12}\)
Quy đồng: \(-\frac{1}{4}=\frac{-1\cdot6}{4\cdot6}=-\frac{6}{24};\frac{3}{8}=\frac{3\cdot3}{8\cdot3}=\frac{9}{24};\frac{7}{12}=\frac{7\cdot2}{12\cdot2}=\frac{14}{24}\)
d, \(-\frac{8}{9};\frac{17}{18};\frac{5}{-6}\)
Giữ nguyên phân số \(\frac{17}{18}\)
Quy đồng: \(-\frac{8}{9}=\frac{-8\cdot2}{9\cdot2}=-\frac{16}{18};\frac{5}{-6}=\frac{5\cdot3}{-6\cdot3}=\frac{15}{-18}=-\frac{15}{18}\)
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Bài 1
a) MC: 75
\(\frac{7}{-15}=\frac{-7}{15}=\frac{-7.5}{15.5}=\frac{-35}{75}\)
\(\frac{-8}{-25}=\frac{8}{25}=\frac{8.3}{25.3}=\frac{24}{75}\)
\(\frac{11}{-75}=\frac{-11}{75}\)
b) MC: 180
Cách làm tương tự
Bài 2:
\(\frac{-1}{8}=\frac{-3}{24}\)
\(\frac{2}{-3}=\frac{16}{-24}=\frac{-16}{24}\)
\(\frac{3}{-72}=\frac{1}{-24}=\frac{-1}{24}\)
\(\frac{5}{-6}=\frac{20}{-24}=\frac{-20}{24}\)
Bài 3:
\(1=\frac{16}{16}\)
\(\frac{5}{-8}=\frac{-10}{16}\)
\(0=\frac{0}{16}\)
https://www.youtube.com/channel/UC5odkiOvzz9Rvu3HUYlL2IQ?view_as=subscriber
a: 3/4=54/72
-1/9=-8/72
-5/8=-45/72
b: -1/7=-8/56
1/8=7/56
3/4=42/56
c: 1/3=10/30
-1/5=-6/30
-1/10=-3/30
a)\(\dfrac{3}{4}=\dfrac{3.18}{4.18}=\dfrac{54}{72}\)
\(\dfrac{1}{-9}=\dfrac{-1}{9}=\dfrac{-1.8}{9.8}=\dfrac{-8}{72}\)
\(\dfrac{-5}{8}=\dfrac{-5.9}{8.9}=\dfrac{-45}{72}\)
b)\(\dfrac{1}{-7}=\dfrac{-1}{7}=\dfrac{-1.8}{7.8}=\dfrac{-8}{56}\)
\(\dfrac{-1}{-8}=\dfrac{1}{8}=\dfrac{1.7}{8.7}=\dfrac{7}{56}\)
\(\dfrac{3}{4}=\dfrac{3.14}{4.14}=\dfrac{42}{56}\)
c)\(\dfrac{1}{3}=\dfrac{1.10}{3.10}=\dfrac{10}{30}\)
\(\dfrac{-1}{5}=\dfrac{-1.6}{5.6}=\dfrac{-6}{30}\)
\(\dfrac{1}{-10}=\dfrac{-1}{10}=\dfrac{-1.3}{10.3}=\dfrac{-3}{30}\)