9/2

k mình nha

= \(\frac{9}{2}\)

ket qua bang 9/2

=21 nha

\(\frac{9}{3}+9\times2=3+9\times2=3+18=21\)

\(\frac{9}{3}+9\times2\) = \(\frac{9}{3}+18=21\) 

\(\frac{1}{2}+\frac{3}{4}=\frac{1.2}{2.2}+\frac{3}{4}=\frac{2}{4}+\frac{3}{4}=\frac{5}{4}\)

\(\frac{2}{-5}-\frac{-7}{9}=-\frac{2}{5}-\frac{-7}{9}=\frac{-2}{5}+\left(-\frac{7}{9}\right)=-\frac{18}{45}+-\frac{35}{45}=-\frac{53}{45}\)

cho kẹo~~~

Câu 1:5/4

nhớ nha gửi lượt kb cho tớ nha

9/5:17/15+8/5:17/15

c1:=17/15:(9/5+8/5)

    =17/15:17/5=1

c2=27/17+24/17

    =51/17

C1 : \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)

\(=\frac{27}{17}+\frac{24}{17}\)

\(=3\)

C2 : \(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)

\(=\left(\frac{9}{5}+\frac{8}{5}\right):\frac{17}{15}\)

\(=\frac{17}{5}:\frac{17}{15}\)

\(=3\)

C1 :

\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)

\(=\left(\frac{9}{5}+\frac{8}{5}\right):\frac{17}{15}\)

\(=\frac{17}{5}:\frac{17}{15}\)

\(=\frac{17}{5}\times\frac{15}{17}\)

\(=\frac{15}{5}=3\)

C2 :

\(\frac{9}{5}:\frac{17}{15}+\frac{8}{5}:\frac{17}{15}\)

\(=\frac{9}{5}.\frac{15}{17}+\frac{8}{5}.\frac{15}{17}\)

\(=\frac{27}{17}+\frac{24}{17}\)

\(=\frac{51}{17}=3\)

1/6 + 9 x 2 

= 1/6 + 18

= 1/6 + 180/6

= 109/6

\(\frac{1}{6}+9x2=\frac{1}{6}+18=\frac{1}{6}+\frac{108}{6}=\frac{1+108}{6}=\frac{109}{6}\)

=1/6+18

=1/6+108/6

=109/6

bạn gửi lời mời kb đi

\(\frac{3}{12}+\frac{2}{4}-\frac{2}{12}\)

\(=\frac{3}{12}+\frac{6}{12}-\frac{2}{12}\)

\(=\frac{3+6-2}{12}\)

\(=\frac{7}{12}\)

\(\frac{3}{12}+\frac{2}{4}-\frac{2}{12}\)

\(=\frac{3}{12}+\frac{6}{12}-\frac{2}{12}\)

\(=\frac{9}{12}-\frac{2}{12}\)

\(=\frac{7}{12}\)

\(\frac{3}{12}+\frac{2}{4}-\frac{2}{12}\)

\(=\frac{3}{12}+\frac{6}{12}-\frac{2}{12}\)

\(=\frac{7}{12}\)

bằng \(\frac{23}{12}\)

đồng ý

\(2\frac{1}{2}:\frac{3}{4}=\frac{5}{2}:\frac{3}{4}\)

= 5/2 x 4/3

=\(\frac{20}{6}\)

M.n tk giùm em vs ạ !! ^_^

Ta có:

\(=\frac{6}{12}+\frac{6}{12}+\frac{20}{12}-\frac{9}{12}\)

\(=\frac{29}{12}\)

Hok tốt

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