a, \(\frac{5}{11}\times\frac{7}{25}+\frac{15}{11}\times\frac{1}{5}\)

\(=\frac{5}{11}\times\frac{7}{25}+\frac{5}{11}\times\frac{3}{5}\)

\(=\frac{5}{11}\times\left(\frac{7}{25}+\frac{3}{5}\right)\)

\(=\frac{5}{11}\times\frac{22}{25}\)

\(=\frac{2}{5}\)

b, \(\frac{3}{7}\times\frac{25}{19}-\frac{1}{7}\times\frac{18}{19}\)

\(=\frac{1}{7}\times\frac{75}{19}-\frac{1}{7}\times\frac{18}{19}\)

\(=\frac{1}{7}\times\left(\frac{75}{19}-\frac{18}{19}\right)\)

\(=\frac{1}{7}\times3\)

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

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Tính

          \(\frac{15}{25}+\frac{80}{125}+\frac{12}{42}+\frac{78}{100}+\frac{18}{12}\)

          \(\frac{3}{5}+\frac{16}{25}+\frac{6}{21}+\frac{39}{50}+\frac{3}{2}\)

          \(\frac{15}{25}+\frac{16}{25}+\frac{39}{50}+\frac{6}{21}+\frac{3}{2}\)

           \(\frac{62}{50}+\frac{39}{50}+\frac{12}{42}+\frac{63}{42}\)

           \(\frac{101}{50}+\frac{75}{42}\)

           \(\frac{4242}{2100}+\frac{3750}{2100}\)

          \(\frac{7992}{2100}\)

Bài làm:

a) 15 x 4 / 30 x 9 = 3 x 5 x 2 x 2 / 3 x 5 x 2 x 3 x 3 = 2/9

b) 4 x 4 x 7/ 14 x 10 x 9 = 2 x 2 x 2 x 2 x 7 / 2 x 7 x 5 x 2 x 3 x 3 = 4/45

c) 5 x 9 x 11 / 44 x 18 = 5 x 3 x 3 x 11 / 4 x 11 x 2 x 3 x 3 = 5/8 

\(1,\frac{3}{5}+\frac{7}{2}-\frac{4}{7}=\frac{42}{70}+\frac{245}{70}-\frac{40}{70}=\frac{247}{70}\)

\(2,\frac{4}{5}-\frac{1}{3}+\frac{3}{4}=\frac{48}{60}-\frac{20}{60}+\frac{45}{60}=\frac{73}{60}\)

\(3,\frac{1}{3}\times\frac{5}{7}:\frac{7}{2}=\frac{5}{21}:\frac{7}{2}=\frac{10}{147}\)

\(4,\frac{1}{2}:\frac{2}{7}\times\frac{4}{7}=\frac{7}{4}\times\frac{4}{7}=1\)

\(5,\frac{19}{15}\times\frac{3}{7}:\frac{4}{9}=\frac{19}{35}:\frac{4}{9}=\frac{171}{140}\)

\(6,\frac{11}{3}:\frac{9}{16}:\frac{3}{8}=\frac{176}{27}:\frac{3}{8}=\frac{1408}{81}\)

_Chúc bạn học tốt _

a, \(\frac{5}{7}+\frac{8}{7}=\frac{13}{7}\)

b,\(\frac{9}{8}-\frac{3}{8}=\frac{6}{8}\)

c,\(\frac{6}{1}:\frac{6}{5}=\frac{6}{1}\cdot\frac{5}{6}=\frac{30}{6}=5\)

~~~Hok tốt ~~~

a,\(\frac{13}{7}\)

b,\(\frac{6}{8}\)= \(\frac{3}{4}\)

c,\(\frac{9}{7}\)

d,5

tớ đang bị kẹt ở phân số \(\frac{1357}{4770}\)

\(\frac{5}{3}\)x 2 + x : \(\frac{4}{3}\)= \(\frac{29}{7}\)

\(\frac{10}{3}\)+ x : \(\frac{4}{3}\)= \(\frac{29}{7}\)

x : \(\frac{4}{3}\)= \(\frac{29}{7}\)- \(\frac{10}{3}\)

x = \(\frac{17}{21}\)x \(\frac{4}{3}\)

x = \(\frac{68}{63}\)

\(\frac{10}{3}+\frac{x.3}{4}=\frac{29}{7}\)

\(\frac{3x}{4}=\frac{29}{7}-\frac{10}{3}=\frac{17}{21}\)

\(x=\frac{68}{63}\)

các bạn ơi làm nhanh giúp mình

đây nè:A=0. tui chắc chắn lun.

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