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a) \(\frac{6}{5}\)- \(\frac{2}{3}\)= \(\frac{18}{15}\)- \(\frac{10}{15}\)= \(\frac{8}{15}\)
b) 1 - \(\frac{4}{5}\)= \(\frac{5}{5}\)- \(\frac{4}{5}\)= \(\frac{1}{5}\)
c) \(\frac{5}{12}\)- \(\frac{1}{4}\)= \(\frac{5}{12}\)- \(\frac{3}{12}\)= \(\frac{2}{12}\)= \(\frac{1}{6}\)
d) \(\frac{7}{8}\) - \(\frac{1}{6}\) = \(\frac{21}{24}\) - \(\frac{4}{24}\)= \(\frac{17}{24}\)
~HT~
a) 6/5 - 2/3 = 8/15
b) 1 - 4/5 = 1/5
c) 5/12 - 1/4 = 1/6
d) 7/8 - 1/6 = 17/24
HT~
a)\(\frac{2}{3}:\frac{4}{9}+\frac{1}{3}:\frac{4}{9}\)
=\(\frac{4}{9}:\left(\frac{2}{3}+\frac{1}{3}\right)\)
=\(\frac{4}{9}:1=\frac{4}{9}\)
b
\(a,\frac{1}{2}\times\frac{4}{5}\div\frac{6}{10}\)
\(=\frac{2}{5}\div\frac{6}{10}\)
\(=\frac{2}{5}\times\frac{10}{6}\)
\(=\frac{2}{3}\)
\(b,\frac{24}{35}\div\left(\frac{4}{5}\times\frac{8}{7}\right)\)
\(=\frac{24}{35}\div\frac{32}{35}\)
\(=\frac{24}{35}\times\frac{35}{32}\)
\(=\frac{3}{4}\)
là những phân số sau: 29/49, 30/49, 31/49, 32/49, 33/49, 34/49 bạn nhé. Nếu sai thì bạn thông cảm nha bạn
a)
`7/12+x=3/2`
`=>x=3/2-7/12`
`=>x=18/12-7/12`
`=>x=11/12`
b)
`1/7:x=1/3`
`=>x=1/7:1/3`
`=>x=1/7xx3`
`=>x=3/7`
a)7/12+x=3/2
X=3/2-7/12
X=11/12
B)1/7:x=1/3
X=1/7:1/3
X=3/7
a)
`7/12+x=3/2`
`=>x=3/2-7/12`
`=>x=18/12-7/12`
`=>x=11/12`
b)
`1/7:x=1/3`
`=>x=1/7:1/3`
`=>x=1/7xx3`
`=>x=3/7`
MSC:105
Quy đồng MS ta có:
7/3= 245/105 8/5=168/105 1/7=15/105
Vì 15/105<168/105<245/105 hay 1/7<8/5<7/3
\(\frac{2}{7}:y=\frac{10}{21}.\frac{9}{14}\)
\(\frac{2}{7}:y=\frac{15}{49}\)
\(y=\frac{2}{7}:\frac{15}{49}\)
\(y=\frac{2}{7}.\frac{49}{15}\)
\(y=\frac{14}{15}\)
\(y-\frac{1}{3}=\frac{10}{21}:\frac{15}{28}\)
\(y-\frac{1}{3}=\frac{10}{21}.\frac{28}{15}\)
\(y-\frac{1}{3}=\frac{8}{9}\)
\(y=\frac{8}{9}+\frac{1}{3}\)
\(y=\frac{8}{9}+\frac{3}{9}\)
\(y=\frac{11}{9}\)
a) Ta có : \(y-\frac{1}{3}=\frac{10}{21}\div\frac{15}{28}\)
\(\Rightarrow\) \(y-\frac{1}{3}=\frac{8}{9}\)
\(\Rightarrow\) \(y\) \(=\frac{8}{9}+\frac{1}{3}\)
\(\Rightarrow\) \(y\) \(=\frac{11}{9}\)
Vậy \(y=\frac{11}{9}\)
b) Ta có : \(\frac{2}{7}\div y=\frac{10}{21}\times\frac{9}{14}\)
\(\Rightarrow\) \(\frac{2}{7}\div y=\frac{15}{49}\)
\(\Rightarrow\) \(y=\frac{2}{7}\div\frac{15}{49}\)
\(\Rightarrow\) \(y=\frac{14}{15}\)
Vậy \(y=\frac{14}{15}\)
Cbht !!!
\(\frac{12}{7}-\frac{7}{10}-\frac{1}{5}=\frac{120}{70}-\frac{49}{70}-\frac{14}{70}=\frac{120-49-14}{70}=\frac{57}{70}\)
\(\frac{12}{7}-\frac{7}{10}-\frac{1}{5}=\frac{120}{70}-\frac{49}{70}-\frac{14}{70}=\frac{120-49-14}{70}=\frac{57}{70}\)
HT