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19 tháng 3 2017

a, \(\frac{3}{2}\)\(\frac{2}{3}\) + \(\frac{4}{3}\)

\(\frac{3}{2}\)+ ( \(\frac{2}{3}\)\(\frac{4}{3}\))

\(\frac{3}{2}\)\(2\)

\(\frac{7}{2}\)

b, \(\frac{3}{5}\)\(\frac{7}{5}\)\(\frac{3}{4}\)

= (\(\frac{3}{5}\)\(\frac{7}{5}\)) + \(\frac{3}{4}\)

\(2\)\(\frac{3}{4}\)

\(\frac{11}{4}\)

26 tháng 2 2019

A,  4/9 + [3/8 + 5/8 ]

    =4/9 + 1

    =13/9

B,  [3/7+4/7]+2/3

=1+2/3

=5/3

26 tháng 2 2019

\(a)\frac{4}{9}+\frac{3}{8}+\frac{5}{8}=\frac{4}{9}+(\frac{3}{8}+\frac{5}{8})=\frac{4}{9}+1=\frac{4+9}{9}=\frac{13}{9}\)

\(b)\frac{3}{7}+\frac{2}{3}+\frac{4}{7}=(\frac{3}{7}+\frac{4}{7})+\frac{2}{3}=1+\frac{2}{3}=\frac{3+2}{3}=\frac{5}{3}\)

15 tháng 2 2017

\(a,\frac{12}{25}+\frac{3}{5}+\frac{13}{25}\)

\(=\left(\frac{12}{25}+\frac{13}{25}\right)+\frac{3}{5}\)

\(=\frac{25}{25}+\frac{3}{5}\)

\(=1+\frac{3}{5}\)

\(=\frac{8}{5}\)

\(b,\frac{3}{2}+\frac{2}{3}+\frac{4}{3}\)

\(=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)\)

\(=\frac{3}{2}+2\)

\(=\frac{7}{2}\)

\(c,\frac{3}{5}+\frac{7}{5}+\frac{3}{4}\)

\(=\left(\frac{3}{5}+\frac{7}{5}\right)+\frac{3}{4}\)

\(=2+\frac{3}{4}\)

\(=\frac{11}{4}\)

19 tháng 2 2017

a. 12/25 + 3 / 5+ 13/25 = ( 12/25+13/25)+3/5 = 1 + 3/5= 8/5

b. 3/2 + 2/3 + 4/3 = 3/2+( 2/3+4/3)= 3/2 + 2=7/2

c.3/5+7/5+3/4= (3/5+7/5)+3/4 = 2+ 3/4=11/4 

chúc bn hc tốt 

19 tháng 2 2017

a. 12/25+3/5+13/25

=1+3/5

=8/5

b.3/2+2/3+4/3

=3/2+2

=7/2

c.3/5+7/5+3/4

=2+3/4

=11/4

6 tháng 9 2018

a)

\(\frac{5.12.3.7}{3.8.7.5}=\frac{1.12.1.1}{1.8.1.10}=\frac{12}{8}=\frac{3}{2}\)

b)

\(\frac{2.5.4.6}{4.3.5.7}\frac{2.1.1.2.3}{1.1.1.7}=\frac{12}{7}\)

HOK TỐT!

6 tháng 9 2018

cảm ơn bạn

14 tháng 2 2018

a) \(\frac{12}{25}+\frac{3}{5}+\frac{134}{25}=\left(\frac{12}{25}+\frac{134}{25}\right)+\frac{3}{5}=\frac{146}{25}+\frac{3}{5}=\frac{146}{25}+\frac{15}{25}=\frac{161}{25}\)

b) \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)=\frac{3}{2}+\frac{6}{3}=\frac{9}{6}+\frac{12}{6}=\frac{21}{6}=\frac{7}{2}\)

c) \(\frac{3}{5}+\frac{7}{5}+\frac{3}{4}=\left(\frac{3}{5}+\frac{7}{5}\right)+\frac{3}{4}=\frac{10}{5}+\frac{3}{4}=2+\frac{3}{4}=\frac{8}{4}+\frac{3}{4}=\frac{11}{4}\)

14 tháng 2 2018

a,\(\frac{12}{25}+\frac{3}{5}+\frac{134}{25}=\frac{12}{25}+\frac{15}{25}+\frac{134}{25}=\frac{161}{25}\)

b, \(\frac{3}{2}+\frac{2}{3}+\frac{4}{3}=\frac{3}{2}+\left(\frac{2}{3}+\frac{4}{3}\right)=\frac{3}{2}+\frac{6}{3}=\frac{3}{2}+2=\frac{7}{2}\)

c, \(\left(\frac{3}{5}+\frac{7}{5}\right)+\frac{3}{4}=\frac{10}{5}+\frac{3}{4}=2+\frac{3}{4}=\frac{11}{4}\)

17 tháng 8 2018

\(\frac{8}{5}:\frac{1}{34}=\frac{8}{5}.34=\frac{272}{5}\)

\(\frac{3}{4}.\frac{2}{9}+\frac{1}{3}=\frac{1}{6}+\frac{1}{3}=\frac{1}{2}\)

\(\frac{6}{15}.4=\frac{24}{15}\)

\(5:\frac{5}{7}=5.\frac{7}{5}=7\)

23 tháng 3 2022

\(a)\frac{3}{5}\times\frac{2}{5}+\frac{3}{4}\times\frac{3}{5}\)

\(=\frac{3}{5}\times\left(\frac{2}{5}+\frac{3}{4}\right)\)

\(=\frac{3}{5}\times\left(\frac{8}{20}+\frac{15}{20}\right)\)

\(=\frac{3}{5}\times\frac{23}{20}\)

\(=\frac{69}{100}\)

\(b)\frac{5}{9}\times\frac{7}{3}\times\frac{9}{5}\)

\(=\left(\frac{5}{9}\times\frac{9}{5}\right)\times\frac{7}{3}\)

\(=1\times\frac{7}{3}\)

\(=\frac{7}{3}\)

23 tháng 3 2022

a) 3/5x2/5+3/4x3/5

=2/5+3/4x(3/5)

=69/100

.B chịu