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3 tháng 1 2017

x * 17 + x * 33 = 150

x * ( 17 + 33 ) = 150

x * 50              = 150 

 x                   = 150 : 50 

x                    = 3

                                                                      x : 14 - x : 10 = 306

                                                                     x : ( 14 - 10 )  = 306

                                                                     x : 4             = 306

                                                                     x                  = 306 x 4

                                                                   x                   = 1224

3 tháng 1 2017

x*17+x*33=150

<=>x*(17+33)=150

<=>x*50=150

=>x=150:50

=>x=3

X:14-X:10=306

<=>X:(14-10)=306

<=>X:4=306

=>X=306*4

=>X=1224

29 tháng 1 2023

\(24680+752\times306\)

\(=24680+230112\)

\(=254792\)

--------------------------

\(14570-1988:14\)

\(=14570-142\)

\(=14428\)

--------------------------

\(9144:36\times78\)

\(=254\times78\)

\(=19812\)

b. \(\dfrac{4.2.3.5.2.6.2.5.3}{4.3.4.5.6.4.5.6}=\dfrac{1}{4}\)

c. \(\dfrac{17.2.101.2005}{17.2.101.2.2005}=\dfrac{1}{2}\)

d. \(\dfrac{2.3.4.2.11.13.17}{3.11.4.4.17.13.2}=\dfrac{1}{2}\)

a)\(\dfrac{4\times6\times10\times12\times15}{4\times12\times5\times24\times30}=\dfrac{2}{2\times2\times2}=\dfrac{2}{8}=\dfrac{1}{4}\)

b)\(\dfrac{34\times101\times2005}{17\times202\times4010}=\dfrac{2}{2\times2}=\dfrac{2}{4}=\dfrac{1}{2}\)

c)\(\dfrac{6\times8\times11\times13\times17}{33\times16\times17\times26}=\dfrac{6}{3\times2\times2}=\dfrac{1}{2}\)

17 tháng 5 2022

a,=3/13.17/29.29/34

=3/13.1/2

=3/26

b,=(4/21+25/42).19/33

=11/14.19/33

=19/42

`a, = 3/13 xx (17/29 xx 29/34)`

`= 3/13 xx 1/2`

`= 3/26`.

`b, = 19/33(4/21 + 25/42)`

`= 19/33 xx ( 33/42 )`

`= 19/42`

17 tháng 5 2022

 

 

(313×1729)×2934

     =313×1729×2934

     =3×17×2913×29×34

     =3×17×2913×29×2×17

     =313×2

     =326

     

     421×1933+2542×1933

     =1933×(421+2542)

     =1933×(842+2542)

     =1933×3342

     =19×3333×42

     

21 tháng 5 2021

33/15 x 35/21 x 63/14 x 9/30

= 11/5 x 5/3 x 9/2 x 3/10

= 99/20

\(\frac{33}{15}\)\(\frac{5}{3}\)\(\frac{9}{2}\)\(\frac{3}{10}\)

\(\frac{11}{3}\)\(\frac{9}{2}\)\(\frac{3}{10}\)

\(\frac{33}{2}\)\(\frac{3}{10}\)

\(\frac{99}{20}\)

16 tháng 3 2023

a)

`3/5xx3/2`

`=3/5xx2/3`

`=2/5`

b)

`3/7:3/14`

`=3/7xx14/3`

`=2`

c)

`5/7xx7/10`

`=1/2`

d)

`5/11xx33/15`

`=5/11xx11/5`

`=1`

16 tháng 3 2023

\(a,\dfrac{3}{5}:\dfrac{3}{2}=\dfrac{3}{5}\times\dfrac{2}{3}=\dfrac{6}{15}=\dfrac{2}{5}\)

\(b,\dfrac{3}{7}:\dfrac{3}{14}=\dfrac{3}{7}\times\dfrac{14}{3}=\dfrac{42}{21}=42:21=2\)

\(c,\dfrac{5}{7}\times\dfrac{7}{10}=\dfrac{35}{70}=\dfrac{1}{2}\)

\(d,\dfrac{5}{11}\times\dfrac{33}{15}=\dfrac{165}{165}=165:165=1\)

AH
Akai Haruma
Giáo viên
20 tháng 3 2022

Lời giải:
\(\frac{15}{17}\times \frac{45}{33}-\frac{15}{17}\times \frac{12}{33}=\frac{15}{17}\times (\frac{45}{33}-\frac{12}{33})=\frac{15}{17}\times \frac{33}{33}=\frac{15}{17}\times 1=\frac{15}{17}\)

20 tháng 3 2022
15/17×45/33-15/33×12/33 = 15/17×(45/33-12/33) = 15/17×1 =15/17

a: \(\dfrac{5}{3}\cdot\dfrac{7}{10}=\dfrac{5}{10}\cdot\dfrac{7}{3}=\dfrac{14}{3}>2\)

\(\dfrac{5}{7}:\dfrac{7}{10}=\dfrac{5}{7}\cdot\dfrac{10}{7}=\dfrac{50}{49}< 2\)

=>\(\dfrac{5}{3}\cdot\dfrac{7}{10}>\dfrac{5}{7}:\dfrac{7}{10}\)

b: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{4}{6}=\dfrac{2}{3}\)

\(\dfrac{8}{9}:\dfrac{4}{3}=\dfrac{8}{9}\cdot\dfrac{3}{4}=\dfrac{8}{4}\cdot\dfrac{3}{9}=\dfrac{2}{3}\)

Do đó: \(\dfrac{4}{5}\cdot\dfrac{5}{6}=\dfrac{8}{9}:\dfrac{4}{3}\)

c: \(\dfrac{5}{11}\cdot\dfrac{33}{15}=\dfrac{5}{15}\cdot\dfrac{33}{11}=\dfrac{3}{3}=1\)

\(\dfrac{6}{17}\cdot\dfrac{34}{25}=\dfrac{34}{17}\cdot\dfrac{6}{25}=2\cdot\dfrac{6}{25}=\dfrac{12}{25}< 1\)

=>\(\dfrac{5}{11}\cdot\dfrac{33}{15}>\dfrac{6}{17}\cdot\dfrac{34}{25}\)

d: \(\dfrac{15}{19}\cdot\dfrac{38}{5}=\dfrac{15}{5}\cdot\dfrac{38}{19}=3\cdot2=6\)

\(\dfrac{15}{16}:\dfrac{3}{8}=\dfrac{15}{16}\cdot\dfrac{8}{3}=\dfrac{15}{3}\cdot\dfrac{8}{16}=\dfrac{5}{2}\)<6

=>\(\dfrac{15}{19}\cdot\dfrac{38}{5}>\dfrac{15}{16}:\dfrac{3}{8}\)