a) 384 : 25 : 4 = 384 : ( 25 x 4 ) = 384 : 100 = 3,84

b) 380 : ( 38 x 2 ) = ( 380 : 38 ) : 2 = 10 : 2 = 5

a)=384:(25*4)=384:100=3,84.

b)37/25:5/4:74/25=37/25*4/5*25/74=37*4*25/5*25*74=2/5.

c)380:(38*2)=(380:38):2=10:2=5.

d)6/11:4/3:5/11:4/3=6/11*3/4*11/5*3/4=6*3*11*3/11*4*5*4=27/40.

k nha

a,384:25:4

=15.36:4

=3.84

#)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

\(\frac{37}{35}:\frac{5}{4}:\frac{74}{25}\)

\(=\frac{37}{35}:\left(\frac{5}{4}\times\frac{74}{25}\right)\)

\(=\frac{37}{35}:\frac{37}{10}\)

\(=\frac{2}{7}\)

\(\frac{37}{35}:\frac{5}{4}:\frac{74}{25}\)

=\(\frac{37}{35}x\frac{4}{5}x\frac{25}{74}\)

\(=\left(\frac{37}{35}x\frac{25}{74}\right)x\frac{4}{5}\)

\(=\frac{1}{7}x\frac{5}{2}x\frac{4}{5}\)

\(=\frac{1x5x2x2}{7x2x5}\)

\(=\frac{2}{7}\)

a.384:25:4=384:[25x4]=384:100=3.84

380:[38x2]=[380:38]x2=20

minh khong biet 

minh moi hoc lop 4

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

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

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

\(=25\%+25\%\times38+25\%\times50+25\%\times11\)

\(=25\%\times\left(1+38+50+11\right)=25\%\times100=25\)

\(\dfrac{25}{100}+\dfrac{1}{4}\times38+25\%\times50+0,25\times11\)

\(0,25+0,25\times38+0,25\times50+0,25\times11+1\)

\(0,25\times\left(38+50+11+1\right)\)

\(0,25\times100\)

\(25\)