#)Giải :

a) 37/25 : 5/4 : 74/25

= 37/25 : 74/25 : 5/4

= 1/2 : 5/4

= 2/5

b) 5,79 : 4 + 5,79 : 0,75

= 5,79 : ( 4 + 0,75 )

= 5,79 : 4,75

= 1,218947368..... \(\approx\)1,2

     #~Will~be~Pens~#

A=\(\frac{37.4.25}{25.5.74}=\frac{37.2.2.25}{25.5.2.37}=\frac{2}{5}\)("." là nhân) 

B=5,79x0,25+5,79x0,75

  =5,79x(0,25+0,75)

  =5,79x1

  =5,79

`5 xx 74 xx 2  = 5xx 2 xx 74 = 10xx74 = 740`

`4xx196xx5 = 4xx5xx196 = 20xx196 = 3920`

`(50 + 25)xx4 = 50xx4 + 25xx4 = 200 + 100 = 300`

`125xx(80+8) = 125xx80 + 125xx8 = 10000 + 1000 = 11000`

\(25\times35\times11\times4\)

\(=\left(35\times11\right)\times\left(25\times4\right)\)

\(=385\times100\)

\(=38500\)

25x35x11x4

=(25x4)x(35x11)

=100x385

=38500

25x35x11x4=(25x4)x(35x11)=100x385=38500

Ta có : 384 : 25 : 4= 384 : 25:4*4:4=384:25*4:4:4=384:100=3,84

\(\frac{37}{25}:\frac{5}{4}:\frac{74}{25}=\frac{37}{25}\cdot\frac{25}{74}:\frac{5}{4}=\frac{37}{74}:\frac{5}{4}=\frac{1}{2}:\frac{5}{4}=\frac{1}{2}\cdot\frac{4}{5}=\frac{2}{5}\)

\(\frac{6}{11}:\frac{4}{3}:\frac{5}{11}:\frac{4}{3}=\frac{6}{11}\cdot\frac{11}{5}:\frac{4}{3}:\frac{4}{3}=\frac{6}{5}\)

234500

`2345 x 25 x 2345 x 74 + 2345`

`= 2345 x ( 25 + 74 + 1 )`

`= 2345 x 100 `

`= 234 500`

học tốt

(25 x 4 ) x (35 x 6 ) = 100 x 210 = 21000

25 x 35 x 4 x 6 

= (25 x 4 ) x ( 35 x 6 ) 

= 100 x 210

= 21 000 

25x35x4x6

=(25x4) x (35x6)

=100x210

=21000

\(25\times35\times4\times6\)

\(=\left(25\times4\right)\times\left(35\times6\right)\)

\(=100\times210\)

\(=21000\)

\(25\times35\times4\times6\)

\(=\left(25\times4\right)\times\left(35\times6\right)\)

\(=100\times210\)

\(=21000\)

\(~HT~\)

=25 x 4 x (35 x 6)

=100 x 210

=21000

a: \(=\dfrac{37}{25}\cdot\dfrac{25}{74}\cdot\dfrac{4}{5}=\dfrac{1}{2}\cdot\dfrac{4}{5}=\dfrac{2}{5}\)

b: \(=\dfrac{6}{11}\cdot\dfrac{11}{5}:\dfrac{16}{9}=\dfrac{6}{5}\cdot\dfrac{9}{16}=\dfrac{54}{80}=\dfrac{27}{40}\)

89x25+74x89+89

=89x25+74x89+89x1

=89x(25+74+1)

=89x100

=8900

89 x 25 + 74 x 89 + 89= 89 x 25 + 74 x 89 + 89 x 1

= 89 x ( 25+74+1)

= 89 x 100

= 8900

 chuẩn luôn ha

89*| 25+74+1|

sau đo làm như thường nhé