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4 7 và 5 12 thì thành 48 72 và 35 72 . 3 8 và 19 24 thì thành 9 24 và 19 24 . giải cho 2 câu thoi hehe..........
a)\(\frac{3}{5}\&\frac{6}{7}\)
\(\frac{3}{5}=\frac{3\times7}{5\times7}=\frac{21}{35}\);\(\frac{6}{7}=\frac{6\times5}{7\times5}=\frac{30}{35}\)
b)\(\frac{7}{8}\&\frac{6}{4}\)( Ta chọn mẫu số chung nhỏ nhất chia hết cho cả hai số )
Giữ nguyên phân số \(\frac{7}{8}\);\(\frac{6}{4}=\frac{6\times2}{4\times2}=\frac{12}{8}\)
c) \(\frac{5}{6}\&\frac{11}{18}\)( Ta chọn 18 là mẫu số chung nhỏ nhất cho cả hai số )
\(\frac{5}{6}=\frac{5\times3}{6\times3}=\frac{15}{18}\); Giữ nguyên phân số \(\frac{11}{18}\)
d) \(\frac{3}{2};\frac{2}{3}\&\frac{4}{7}\)
\(\frac{3}{2}=\frac{3\times3\times7}{2\times3\times7}=\frac{63}{42}\)
\(\frac{2}{3}=\frac{2\times2\times7}{3\times2\times7}=\frac{28}{42}\)
\(\frac{4}{7}=\frac{4\times3\times2}{7\times3\times2}=\frac{24}{42}\)
`MSC:15`
`2/5=(2xx3)/(5xx3)= 6/15`
`7/15` giữ nguyên
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`MSC : 24`
`3/4=(3xx6)/(4xx6)= 18/24`
`5/6 =(5xx4)/(6xx4)= 20/24`
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`MSC : 99`
`8/9 =(8xx11)/(9xx11)= 88/99`
`8/11=(8xx9)/(11xx9)= 72/99`
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`MSC:30`
`1/2 =(1xx15)/(2xx15)= 15/30`
`2/3=(2xx10)/(3xx10)=20/30`
`3/5=(3xx6)/(5xx6)= 18/30`
\(a,\)\(\dfrac{2}{5};\dfrac{7}{15}\left(MSC:15\right)\)
\(\dfrac{2}{5}=\dfrac{2\times3}{5\times3}=\dfrac{6}{15}\)
\(b,\dfrac{3}{4};\dfrac{5}{6}\left(MSC:12\right)\)
\(\dfrac{3}{4}=\dfrac{3\times3}{4\times3}=\dfrac{9}{12}\)
\(\dfrac{5}{6}=\dfrac{5\times2}{6\times2}=\dfrac{10}{12}\)
\(c,\dfrac{8}{9};\dfrac{8}{11}\left(MSC:99\right)\)
\(\dfrac{8}{9}=\dfrac{8\times11}{9\times11}=\dfrac{88}{99}\)
\(\dfrac{8}{11}=\dfrac{8\times9}{11\times9}=\dfrac{72}{99}\)
\(d,\dfrac{1}{2};\dfrac{2}{3};\dfrac{3}{5}\left(MSC:30\right)\)
\(\dfrac{1}{2}=\dfrac{1\times15}{2\times15}=\dfrac{15}{30}\)
\(\dfrac{2}{3}=\dfrac{2\times10}{3\times10}=\dfrac{20}{30}\)
\(\dfrac{3}{5}=\dfrac{3\times6}{5\times6}=\dfrac{18}{30}\)
a: 5/6=25/30
9/30=9/30
b: 7/8=49/56
5/7=40/56
c: 2/9=4/18
5/18=5/18
d: 3/10=6/20
1/4=5/20
5/6=25/30
9/30=9/30
7/8=49/56
5/7=40/56
2/9=4/18
5/18=5/18
3/10=6/20
1/4=5/20
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) \(\dfrac{4}{7}và\dfrac{5}{6}\)⇔ \(\dfrac{24}{42}và\dfrac{35}{42}\)
b) \(\dfrac{5}{14}và\dfrac{3}{8}\)⇔ \(\dfrac{20}{56}và\dfrac{21}{56}\)
c) \(\dfrac{9}{10}và\dfrac{7}{5}\)⇔ \(\dfrac{9}{10}và\dfrac{14}{10}\)
d) \(\dfrac{3}{5};\dfrac{5}{6}và\dfrac{7}{30}\)⇔ \(\dfrac{18}{30};\dfrac{25}{30}và\dfrac{7}{30}\)
Help me
a) 2/7=6/21;2/3=6/21
b)4/3=20/15;7/5=21/15
c) 3/8=18/48;5/6=40/48
d) 4/3=24/18;7/6=21/18
Tick đúng mik nha