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a, \(\frac{3}{8};-\frac{7}{11}\)
Quy đồng mẫu số: \(\frac{3}{8}=\frac{3\cdot11}{8\cdot11}=\frac{33}{88};-\frac{7}{11}=\frac{-7\cdot8}{11\cdot8}=-\frac{56}{88}\)
b, \(\frac{7}{15};-6\)
Quy đồng mẫu số: \(-6=\frac{-6\cdot15}{15}=-\frac{90}{15}\)
c, \(-\frac{3}{16};\frac{-5}{-24}\) ; \(-\frac{21}{56}\)
Quy đồng mẫu số:
\(-\frac{3}{16}=\frac{-3\cdot3}{16\cdot3}=-\frac{9}{48};\frac{-5}{-24}=\frac{5}{24}=\frac{5\cdot2}{24\cdot2}=\frac{10}{48}\)
\(-\frac{21}{56}=-\frac{3}{8}=\frac{-3\cdot6}{8\cdot6}=-\frac{18}{48}\)
a) -12/18=-420/630
-21/35=-378/630
-420/630+378/630=-42/630=-1/15
b) 27/5=81/15
8/3 = 40/15
81/15+40/15=121/15
c) 11/4=77/28
9/7=36/28
77/28+36/28=113/28
a) -12/18=-420/630
-21/35=-378/630
-420/630+378/630=-42/630=-1/15
b) 27/5=81/15
8/3 = 40/15
81/15+40/15=121/15
c) 11/4=77/28
9/7=36/28
77/28+36/28=113/28
MSC: 36
\(-\dfrac{7}{12}=-\dfrac{7\times3}{12\times3}=\dfrac{21}{36}\)
\(-\dfrac{11}{18}=-\dfrac{11\times2}{18\times2}=-\dfrac{22}{36}\)
a: 4/15+-7/12=16/60-35/60=-19/60
b: 5/12-7/18=15/36-14/36=1/36
g: 7/36-5/24=14/72-15/72=-1/72
h: -11/12-2=-11/12-24/12=-35/12
j: -5/18-7/12=-10/36-21/36=-31/36
a: \(\dfrac{-7}{15}=\dfrac{-7\cdot4}{15\cdot4}=\dfrac{-28}{60}\)
\(\dfrac{5}{12}=\dfrac{5\cdot5}{12\cdot5}=\dfrac{25}{60}\)
b: \(\dfrac{1}{5}=\dfrac{1\cdot6}{5\cdot6}=\dfrac{6}{30}\)
\(\dfrac{-2}{3}=\dfrac{-2\cdot10}{3\cdot10}=\dfrac{-20}{30}\)
\(\dfrac{7}{10}=\dfrac{7\cdot3}{10\cdot3}=\dfrac{21}{30}\)
c: \(\dfrac{-15}{50}=\dfrac{-15\cdot3}{50\cdot3}=\dfrac{-45}{150}\)
\(\dfrac{9}{10}=\dfrac{9\cdot15}{10\cdot15}=\dfrac{135}{150}\)
\(\dfrac{26}{-30}=\dfrac{-26}{30}=\dfrac{-26\cdot5}{30\cdot5}=\dfrac{-130}{150}\)
d: \(\dfrac{7}{10}=\dfrac{7\cdot51}{10\cdot51}=\dfrac{357}{510}\)
\(\dfrac{-5}{-15}=\dfrac{1}{3}=\dfrac{1\cdot170}{3\cdot170}=\dfrac{170}{510}\)
\(\dfrac{3}{17}=\dfrac{3\cdot30}{17\cdot30}=\dfrac{90}{510}\)
e: \(\dfrac{-4}{-75}=\dfrac{4}{75}=\dfrac{4}{75}\)
\(\dfrac{-3}{5}=\dfrac{-3\cdot15}{5\cdot15}=\dfrac{-45}{75}\)
\(\dfrac{8}{25}=\dfrac{8\cdot3}{25\cdot3}=\dfrac{24}{75}\)
f: \(-\dfrac{4}{5}=\dfrac{-4\cdot7}{5\cdot7}=\dfrac{-28}{35}\)
\(\dfrac{6}{7}=\dfrac{6\cdot5}{7\cdot5}=\dfrac{30}{35}\)
\(\dfrac{5}{12}=\dfrac{5.3}{12.3}=\dfrac{15}{36};\dfrac{7}{18}=\dfrac{7.2}{18.2}=\dfrac{14}{36}\)
\(\dfrac{5}{12}\) = \(\dfrac{5.3}{12.3}\) = \(\dfrac{15}{36}\)
\(\dfrac{7}{18}\) = \(\dfrac{7.2}{18.2}\) = \(\dfrac{14}{36}\)
Vậy hai phân số \(\dfrac{5}{12}\) và \(\dfrac{7}{18}\) đã được quy đồng mẫu số lần lượt thành các phân số sau: \(\dfrac{15}{36}\); \(\dfrac{14}{36}\)
mik đang cần gấp nhanh nhé
-9/30 III -14/30
15/36 III 22/36