a) 19,17x25x4=19,17(25x4)=19,17x100=1917

b)1,79x(8x125)=1,79x1000=1790

chúc bạn học tốt

=(25x4)x165=165x100=16500

25 x 165 x 4

= 25 x 660

=16500

Ta có: 25 x 165 x 4 = ( 25 x 4 ) x 165 = 100 x 165 = 16500

4 x 18 x 25

= 18 x (4 x 25)

= 10 x 100 = 1800

\(\left(25\times32\right)\div4\\ =25\times32\div4\\ =25\times\left(32\div4\right)\\ =25\times8\\ =200\)

`(25 \times 32) \div 4`

`= (25 \times 4 \times 8) \div 4`

`= (100 \times 8) \div 4`

`= 800 \div 4`

`= 200`

302 x 16 + 302 x 4

= 302 x ( 16 +4)

= 302 x 20 = 6040

(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

= 4 x 25 x5

= 100 x 5

=500

4 x 5 x 25

=20 x 25

=500

4x5x25

=4x25x5

=100x5

=500 nha