a)\(9,65\cdot0,4\cdot2,5\)

\(=9,65\cdot1=9,65\)

b)\(0,25\cdot40\cdot9,84\)

\(=10\cdot9,84=98,4\)

c)\(7,38\cdot1,23\cdot50\)

\(=36,9\cdot12,3\)

\(=453,87\)

d)\(0,4\cdot0,5\cdot64,2\)

\(=0,1\cdot128,4=12,84\)

= 15,8 x 8 + 15,8 x 2.

= 15,8 x ( 8 + 2)

= 15,8 x 10

= 158

vầy thì làm sao giải dc

bạn bảo 15,9 hay 15,8

2/5 x 5/4 + 5/4 x 3/5

\(\frac{2}{5}\times\frac{5}{4}+\frac{5}{4}\times\frac{3}{5}\)

\(=\left(\frac{2}{5}+\frac{3}{5}\right)\times\frac{5}{4}\)

\(=\frac{5}{5}\times\frac{5}{4}\)

\(=1\times\frac{5}{4}\)

Rùi đó, bn tự làm đi

bằng 8 nhé bạn

tích mk nha 

kb lun

( 4 x 5 ) + 6 - ( 6 x 3 ) 

= ( 20 + 6 ) - 18

= 26 - 18 

= 8

4*5+6 -6*3

=20+6-18

=26-18

=8

35 x 3/4 +45,5 x 75/100 + 20,5 x75% - 0,75 

= 35. 0,75 + 45,5 . 0,75+ 20,5 . 0,75 - 0,75.1

= 0,75( 35+45,5 + 20,5 -1)

= 0,75.100

= 75

???????😅 😅 😅

\(0,5\times2,5\times40\times200\)

\(=\left(0,5\times200\right)\times\left(2,5\times40\right)\)

\(=100\times100\)

\(=10000\)

Học tốt 

=(2,5*40)*(0,5*200)

=100*100

=10000

7,7 x 0,25 - 0,1 + 2,4 x 0,25

= ( 7,7 + 2,4 ) x 0,25 - 0,1

= 10,1 x 0,25 - 0,1

= 2,525 - 0,1

= 2,425

Bạn chắc đúng không vậy?

\(7,7\times0,25-0,1+2,4\times0,25\)

\(=7,7\times0,25-0,4\times0,25+2,4\times0,25\)

\(=0,25\times\left(7,7-0,4+2,4\right)\)

\(=0,25\times9,7\)

\(=2,425\)

\(a,250:25+1750:25+500:25=\left(250+1750+500\right):25=2500:25=100\\ b,\left(480\times25\right):60=\left(480:60\right)\times25=8\times25=200\)

a) \(250:25+1750:25+500:25\)
\(=\left(250+1750+500\right):25\)
\(=2500:25\)
\(=100\)

b: =8x25=200

a: =10+70+20=100

( 792,36 . 0,75 + 792,36 : 4 ) : 7,2

= 792,36 . ( 0,75 + 4 ) : 7,2

= 792,36 .     4,75       : 7,2

= 3763,71                  : 7,2

= 522,7375

Hk tốt,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

k nhé

tks bạn nhiều