Quy đồng mẫu số sau: 17/150 ; 7/50 ; 4/75
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\(\dfrac{2}{17}=\dfrac{4}{34}\)
\(\dfrac{5}{34}=\dfrac{5}{34}\)
\(\frac{4}{5}\)và\(\frac{7}{3}\)
\(MSC:15\)
\(\frac{4}{5}=\frac{4\times3}{5\times3}=\frac{12}{15}\)
\(\frac{7}{3}=\frac{7\times5}{3\times5}=\frac{35}{15}\)
\(\dfrac{15}{90}\) = \(\dfrac{1}{6}\) = \(\dfrac{1.5}{6.5}\) = \(\dfrac{5}{30}\)
\(\dfrac{120}{600}\) = \(\dfrac{1}{5}\) = \(\dfrac{1.6}{5.6}\) = \(\dfrac{6}{30}\)
\(\dfrac{75}{150}\) = \(\dfrac{1}{2}\) = \(\dfrac{1.15}{2.15}\) = \(\dfrac{15}{30}\)
Ta có:
\(\dfrac{15}{90}=\dfrac{1}{6};\dfrac{120}{600}=\dfrac{1}{5};\dfrac{75}{150}=\dfrac{1}{2}\)
\(\Rightarrow MSC\) là: \(60\)
\(\dfrac{1}{6}=\dfrac{1.10}{6.10}=\dfrac{10}{60}\)
\(\dfrac{1}{5}=\dfrac{1.12}{5.12}=\dfrac{12}{60}\)
\(\dfrac{1}{2}=\dfrac{1.30}{2.30}=\dfrac{30}{60}\)
Câu 1:
MSC=60
7/10=7.6/10.6=42/60 5/-12=-5/12=-5.5/12.5=-25/60
Câu 2:
17/34=1/2; -12/22=-6/11; -25/35=-5/7; 125/75=5/3
Câu 3:
MSC=24
1/3=1.8/3.8=8/24 -3/8=-3.3/8.3=-9/24 17/24=17/24
MSC:60
\(\dfrac{1}{2}=\dfrac{1\times30}{2\times30}=\dfrac{30}{60}\); \(\dfrac{2}{3}=\dfrac{2\times20}{3\times20}=\dfrac{40}{60}\); \(\dfrac{3}{4}=\dfrac{3\times15}{4\times15}=\dfrac{45}{60}\); \(\dfrac{17}{10}=\dfrac{17\times6}{10\times6}=\dfrac{102}{60}\)
\(\dfrac{1}{2}=\dfrac{30}{60}\)
\(\dfrac{2}{3}=\dfrac{40}{60}\)
\(\dfrac{3}{4}=\dfrac{45}{60}\)
\(\dfrac{17}{10}=\dfrac{102}{60}\)
15 /17=17/17-2/17
3/5=5/5-2/5
Vì 17/17=5/5 mà 2/17<2/5 =>15/17>3/5
(vì phần bù càng lớn thì phân số càng bé)
\(MSC\left(150;50;75\right)=150\)
\(\dfrac{17}{150}\)
\(\dfrac{7}{50}=\dfrac{14}{150}\)
\(\dfrac{4}{75}=\dfrac{16}{150}\)
Đính chính \(\dfrac{7}{50}=\dfrac{21}{150}\)