Quy đồng mẫu số các phân số sau:
2/3; 3/4 và 7/12
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\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
\(\frac{3}{5}=\frac{24}{40};\frac{3}{8}=\frac{15}{40};\frac{3}{10}=\frac{12}{40};\frac{3}{2}=\frac{60}{40}\)
\(\frac{3}{5}=\frac{3\times8}{5\times8}=\frac{24}{40}\)
\(\frac{3}{8}=\frac{3\times5}{8\times5}=\frac{15}{40}\)
\(\frac{3}{10}=\frac{3\times4}{10\times4}=\frac{12}{40}\)
\(\frac{3}{2}=\frac{3\times20}{2\times20}=\frac{60}{40}\)
+)
\(\frac{1}{2}=\frac{6}{12};\frac{1}{3}=\frac{4}{12};-\frac{1}{12}\)
+)
\(\frac{9}{30}=\frac{3}{10}=\frac{12}{40};\frac{98}{80}=\frac{49}{40}\)
1/2=6/12 1/3=4/12 -1/12=-1/12
9/30=3/10 98/80=49/40
3/10=12/40 49/40=49/40
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
\(\dfrac{1}{2}=\dfrac{1\times30}{2\times30}=\dfrac{30}{60}\); \(\dfrac{2}{3}=\dfrac{2\times20}{3\times20}=\dfrac{40}{60}\); \(\dfrac{3}{4}=\dfrac{3\times15}{4\times15}=\dfrac{45}{60}\); \(\dfrac{17}{10}=\dfrac{17\times6}{10\times6}=\dfrac{102}{60}\)
\(\dfrac{1}{2}=\dfrac{30}{60}\)
\(\dfrac{2}{3}=\dfrac{40}{60}\)
\(\dfrac{3}{4}=\dfrac{45}{60}\)
\(\dfrac{17}{10}=\dfrac{102}{60}\)
bài3
1. \(\frac{4}{3}\)= \(\frac{4x4}{3x4}\)=\(\frac{20}{12}\)
\(\frac{3}{4}\)=\(\frac{3x3}{4x3}\)=\(\frac{9}{12}\)
2.\(\frac{5}{4}\)=\(\frac{5x6}{4x6}\)=\(\frac{30}{24}\)
\(\frac{5}{6}\)=\(\frac{5x4}{6x4}\)=\(\frac{20}{24}\)
3.\(\frac{3}{8}\)=\(\frac{3x6}{8x6}\)=\(\frac{18}{48}\)
\(\frac{1}{6}\)=\(\frac{1x6}{6x8}\)=\(\frac{6}{48}\)
4.\(\frac{2}{5}\)=\(\frac{2x7}{5x7}\)=\(\frac{14}{35}\)
\(\frac{4}{7}\)=\(\frac{4x5}{7x5}\)=\(\frac{20}{35}\)
a: 1/3=20/60
1/4=15/60
4/5=48/60
b: 1/2=6/12
2/3=8/12
3/4=9/12
\(\dfrac{2}{3}=\dfrac{10}{15};\dfrac{3}{5}=\dfrac{9}{15};\dfrac{7}{15}=\dfrac{7}{15}\)
8/12; 9/12; 7/12