47,5 * 0,5 * 4 

= 47,5 * ( 0,5 * 4 )

= 47,5 * 2 

= 95

4   *  6,58   *  2,25

= 6,58 * ( 2,25 * 4 ) 

= 6,58 * 9 

= 59,22

1,25 * 2 * 13,8 * 4 

= ( 1,25 * 4 ) * ( 13,8 * 2 ) 

=      5              *      27,6 

= 138

47,5.0,5.4

=47,5.(0,5.4)

=47,5.2

=95

4.6,58.2.25

=(4.2,25).6,58

=9.6,58

=59,22

1,25.2.13,8.4

=(1,25.4.2).13,8

=10.13,8=138

k mk nhé

47,5.0,5.4

=47,5.(0,5.4)

=47,5.2

=95 4.6,58.2.25

=(4.2,25).6,58

=9.6,58

=59,22

\(13,8:0,5+13,8:0,25+13,8:0,125\)
\(=13,8\times2+13,8\times4+13,8\times8\)
\(=13,8\times\left(2+4+8\right)\)
\(=13,8\times14\)
\(=193,2\)

Cần gấp

13,8:(0.5+0,25+0.125)

=13,8:1

=13,8

Chú ý:Dấu * là dấu nhân

1,25*0,35*0,8+0,5614+1,4386

=(1.25*0,8)*0,35+(0,5614+1,4386)

=1*0,35+2

=0,35+2

=2,35

Tìm x

(x+12,39):0,76=205,8

x+12,39          =205,8*0.76

x+12,39          =156,408

x                     =156,408-12,39

x                     =144,018

325,02-x=8,37*13,8

325,02-x=115,506

x=325,02-115,506

x=209,514

=3/4.0,25+3/4.1,25-3/4.0,5

=3/4.(0,25+1,25-0,5)

=3/4.10

=15/2

`3/4.0,25+3/4.1,25-3/4.0,5`

`=3/4.(0,25+1,25-0,5)`

`=3/4xx10=15/2`

=3/4x(0,25+1,25-0,5)=3/4x10=15/2

\(1,25:0,5+1,25\times8\\ =1,25\times2+1,25\times8\\ =1,25\times\left(2+8\right)\\ =1,25\times10\\ =12,5\)

giúp mình với

\(a,\dfrac{7}{9}-\dfrac{2}{7}+\dfrac{2}{3}+\dfrac{4}{7}\\ =\left(\dfrac{7}{9}+\dfrac{6}{9}\right)+\left(\dfrac{4}{7}-\dfrac{2}{7}\right)\\ =\dfrac{13}{9}+\dfrac{2}{7}\\ =\dfrac{109}{63}\\ b,13,8+7-5,25+4,25\\ =\left(13,8+7\right)-\left(5,25-4,25\right)\\ =20,8-1\\ =19,8\)

a \(\left(\dfrac{4}{7}-\dfrac{2}{7}\right)+\left(\dfrac{7}{9}+\dfrac{2}{3}\right)=\dfrac{2}{7}+\left(\dfrac{7}{9}+\dfrac{6}{9}\right)=\dfrac{2}{7}+\dfrac{15}{9}=\dfrac{2}{7}+\dfrac{5}{3}=\dfrac{6}{21}+\dfrac{35}{21}=\dfrac{41}{21}\)

b \(20.8-1=19.8\)

=1,25 : 0,25 + 5 *1,25 + 1,25

=1,25 x 4 +5 x 1,25 +1,25 x 1

=1,25 x (4+5+1)

=1,25 x 10

=12,5

Trả L:

1,25 x 0,25 x 8 x 4

= ( 1,25 x 8 ) x ( 0,25 x 4 )

= 10 x 1

= 10

hok tốt

💯💯💯💯💯💯💯💯💯💯💯💯💯💯💯💯💯💯 hepmi 

250 ×5 ×2

= 250 ×10

= 2500

0,8 × 1,25 × 0,29 = 1 × 0,29

= 0,29