a) 9/22 x 33/18 =3/4

b) 12/35 : 36/25 = 5/21

c) 19/17 : 76/51 =3/4

a) \(\frac{9}{22}\times\frac{33}{18}\)

\(=\frac{9}{22}\times\frac{11}{6}\)

\(=\frac{9\times11}{22\times6}=\frac{3}{4}\)

b) \(\frac{12}{35}:\frac{36}{25}=\frac{12}{35}\times\frac{25}{36}\)

                     \(=\frac{5}{21}\)

c) \(\frac{19}{17}:\frac{76}{51}=\frac{19}{17}\times\frac{51}{76}\)

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

\(a,\frac{9}{22}x\frac{33}{18}\)

\(=\frac{3.3.11.3}{11.2.3.3.2}\)

\(=\frac{3}{2.2}\)

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

\(b,\frac{12}{35}:\frac{36}{25}\)

\(=\frac{12}{35}.\frac{25}{36}\)

\(=\frac{12.25}{35.36}\)

\(=\frac{12.5.5}{5.7.12.3}\)

\(=\frac{5}{7.3}\)

\(=\frac{5}{21}\)

\(c,\frac{19}{17}:\frac{76}{51}\)

\(=\frac{19}{17}.\frac{51}{76}\)

\(=\frac{19.51}{17.76}\)

\(=\frac{19.17.3}{17.19.4}\)

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

tách mỗi thừa số ra

a,\(\frac{3\cdot3\cdot5\cdot3\cdot11\cdot2}{3\cdot10\cdot3\cdot3\cdot11\cdot4}=\frac{1}{10}\)

9/22 × 33/18

= 9×33/22×18

= 9×3×11/11×2×2×9

= 3/4

\(\frac{9}{22}\times\frac{33}{18}\)

\(=\frac{9\times33}{22\times18}\)

\(=\frac{297}{396}\)

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

9/22×33/18=

a) \(\frac{9}{22}\cdot\frac{33}{8}=\frac{3^2\cdot3\cdot11}{2\cdot11\cdot2^3}=\frac{3^4}{2^4}=\frac{81}{16}\)

b) \(\frac{12}{35}:\frac{36}{35}=\frac{2^2\cdot3}{2^2\cdot3^2}=\frac{1}{3}\)

c) \(\frac{19}{17}:\frac{76}{51}=\frac{19\cdot3\cdot17}{17\cdot2^2\cdot19}=\frac{3}{4}\)

a)\(x:\frac{9}{22}=44\)                                    b)\(x:\frac{5}{11}=33\)                           c)\(x:\frac{4}{33}=22\)

 \(x\)     \(=44\times\frac{9}{22}\)                        \(x\)       \(=33\times\frac{5}{11}\)                \(x\)       \(=22\times\frac{4}{33}\)    

   \(x\)      \(=18\)                                    \(x\)         \(=15\)                          \(x\)        \(=\frac{8}{3}\)

A) X : 9/22 = 44

              X=44x9/22

              X=18

B) X : 5/11 = 33

              X=33x5/11

              X=15

C) X : 4/33 = 22

              X=22x4/33

              X=8/3

\(x:\frac{9}{22}=44\)

\(x=44X\frac{9}{22}\)

\(x=18\)

vậy X = 18

\(x:\frac{5}{11}=33\)

\(x=33X\frac{5}{11}\)

\(x=15\)

vậy X = 15

\(x:\frac{4}{33}=22\)

\(x=22X\frac{4}{33}\)

\(x=\frac{8}{3}\)

vậy X = \(\frac{8}{3}\)

a. `306xx 18-306 xx 8=306 xx (18-8) =306 xx 10=3060`

b. `9 xx 9+25xx9 +33 xx18`

`=9 xx9 + 25 xx 9 + 33 xx 2 xx 9`

`=9x (9+25+33xx2)`

`=9 xx (9+25+66)`

`=9 xx 100`

`=900`

a) \(306\cdot18-306\cdot8=306\cdot10=3060\)

b) \(9\cdot9+25\cdot9\cdot33\cdot18=9\cdot9\cdot\left(1+25\cdot33\cdot2\right)=81\cdot1651=133731\)

a. 

b. 

a) \(\frac{9}{22}.\frac{33}{18}=\frac{9.33}{22.18}=\frac{297}{396}=\frac{3}{4}\)

b) \(\frac{12}{35}:\frac{36}{25}=\frac{12}{35}.\frac{25}{36}=\frac{12.25}{35.36}=\frac{300}{1260}=\frac{5}{21}\)

c) \(\frac{19}{17}:\frac{76}{51}=\frac{19}{17}.\frac{51}{76}=\frac{19.51}{17.76}=\frac{969}{1292}=\frac{3}{4}\)

thường

a,3/4

b,5/21

c,3/4

a) 2x -18 = 10

    =>2x = 28

    => x = 14

b) 3x + 26 = 5

=> 3x = -21

=> x = -7

Ai làm cả 2 bài mình tích

Áp dụng tính chất DTSBN :

\(\dfrac{x}{5}=\dfrac{y}{8}=\dfrac{2y}{16}=\dfrac{x-2y}{5-16}=\dfrac{33}{-11}=-3\)

\(\Rightarrow y=-3.8=-24\)

=> Chọn đáp án : D

D.-24

D.-24