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a, \(\dfrac{5}{3}và.\dfrac{29}{14}\)
b, \(\dfrac{9}{21};\dfrac{33}{77};\dfrac{45}{105}\)
a) \(\dfrac{5}{3};\dfrac{29}{14}\)
b) \(\dfrac{9}{21};\dfrac{45}{105}\)
a) \(\dfrac{5}{3}\);\(\dfrac{99}{100}\);\(\dfrac{29}{14}\)
b) \(\dfrac{9}{21}\);\(\dfrac{33}{77}\);\(\dfrac{45}{105}\)
24/36=2/3
25/100=1/4
12/18=2/3
72/56=9/7
3535/3737=35/37
\(\dfrac{24}{36}=\dfrac{24:12}{36:12}=\dfrac{2}{3}\)
\(\dfrac{25}{100}=\dfrac{25:25}{100:25}=\dfrac{1}{4}\)
\(\dfrac{12}{18}=\dfrac{12:6}{18:6}=\dfrac{2}{3}\)
\(\dfrac{72}{56}=\dfrac{72:8}{56:8}=\dfrac{9}{7}\)
\(\dfrac{3535}{3737}=\dfrac{3535:101}{3737:101}=\dfrac{35}{37}\)
`3-5/3`
`=3/1-5/3`
`=9/3-5/3`
`=4/3`
`15/7-2`
`=15/7-2/1`
`=15/7-14/7`
`=1/7`
3 - 5/3
=3/1 - 5/3 = 9/3 - 5/3
= 4/3
15/7 - 2
= 15/7 - 2/1 = 15/7 - 14/7
= 1/7
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tick đúng cho mình nha, chúc cậu học tốt
`a,MSC:45`
`7/9=(7xx5)/(9xx5)=35/45`
`2/5=(2xx9)/(5xx9)=18/35`
`b,MSC:21`
`6/7=(6xx3)/(7xx3)=18/21`
`17/21` giữ nguyên
`c,MSC:36`
`2/3=(2xx12)/(3xx12)=24/36`
`1/4=(1xx9)/(4xx9)=9/36`
`5/9=(5xx4)/(9xx4)=20/36`
\(a,\frac{5}{4}-\frac{1}{8}=\frac{10-1}{8}=\frac{9}{8}\)
\(b,\frac{6}{7}+\frac{4}{21}=\frac{18+4}{21}=\frac{22}{21}\)
\(c,\frac{6}{7}-\frac{3}{6}=\frac{36-21}{42}=\frac{5}{14}\)
\(d,\frac{5}{9}+\frac{3}{4}=\frac{20+27}{36}=\frac{47}{36}\)
\(e,\frac{2}{5}\times\frac{4}{7}=\frac{8}{35}\)
a) 5/4 - 1/8 b) 6/7 + 4/21 c) 6/7 - 3/6 d) 5/9 + 3/4 e) 2/5 x 4/7 h) 3/10 : 6/10
= 10/8 - 1/8 = 18/21 + 4/21 = 6/7 - 1/2 = 20/36 + 27/36 = 8/35 = 3/10 : 3/5
= 9/8 = 22/21 = 6/7 + ( -1/2 ) = 47/36 = 3/10 x 5/3
= 12/14 + ( -7/14 ) = 15/30
= 5/14 = 1/2 chúc bạn học tốt nhé !
\(a,\frac{2}{7}:\frac{4}{5}=\frac{2}{7}\times\frac{5}{4}=\frac{10}{28}=\frac{5}{14}\)
\(b,\frac{3}{8}:\frac{9}{4}=\frac{3}{8}\times\frac{4}{9}=\frac{12}{72}=\frac{1}{6}\)
\(c,\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\times\frac{7}{4}=\frac{56}{84}=\frac{2}{3}\)
\(d,\frac{5}{8}:\frac{15}{8}=\frac{5}{8}\times\frac{8}{15}=\frac{40}{120}=\frac{1}{3}\)
A,\(\frac{2}{7}:\frac{4}{5}=\frac{2}{7}\times\frac{5}{4}=\frac{10}{28}=\frac{5}{14}\)
B,\(\frac{3}{8}:\frac{9}{4}=\frac{3}{8}\times\frac{4}{9}=\frac{12}{72}=\frac{1}{6}\)
C.\(\frac{8}{21}:\frac{4}{7}=\frac{8}{21}\times\frac{7}{4}=\frac{56}{84}=\frac{2}{3}\)
D.\(\frac{5}{8}:\frac{15}{8}=\frac{5}{8}\times\frac{8}{15}=\frac{40}{120}=\frac{1}{3}\)
Đúng 100%
a, \(\dfrac{5}{6}\) = \(\dfrac{10}{12}\) = \(\dfrac{30}{36}\) b, \(\dfrac{40}{16}\) = \(\dfrac{10}{4}\) = \(\dfrac{200}{80}\)
c, \(\dfrac{9}{12}\) = \(\dfrac{3}{4}\) = \(\dfrac{54}{72}\) d, \(\dfrac{84}{21}\) = \(\dfrac{28}{7}\) = \(\dfrac{4}{1}\)
\(\dfrac{4}{3}+\dfrac{5}{21}=\dfrac{28}{21}+\dfrac{5}{21}=\dfrac{33}{21}=\dfrac{11}{7}\)
` 4/3 + 5/21= (4xx7)/(3xx7) + 5/21=28/21 + 5/21=(28+5)/21= 33/21=11/7`