= 12345 x ( 3 + 2 + 4 )

= 12345 x 10

=123450

A = 12345 x 3 + 12345 x 2 + 12345 + 12345 x 4

A = 12345 x 3 + 12345 x 2 + 12345 x 1 + 12345 x 4

A = 12345 x (3 + 2 + 1 + 4)

A = 12345 x 10

A =  123450

12345 x 3 + 12345 x 2 + 12345 x1 +12345 x 4 

12345 x ( 3+ 2 + 1 + 4 ) 

12345 x 10 

123450

12345 x 17 + 23 x 12345 + 12345 + 12345 x 35 + 12345 x 24

12345 x ( 17 + 23 + 35 + 24 )

12345 x 99

1222155

= 12345 x 17 + 23 x 12345 + 12345 x 1 + 12345 x 35 + 12345 x 24

= 12345 x ( 17 + 23 + 1 + 35 + 24 )

= 12345 x 100

= 1234500

12345 x 17 + 23 x 12345 + 12345 + 12345 x 35 + 12345 x 24

= 12345 x 17 + 23 x 12345 + 12345 x 1 + 12345 x 35 + 12345 x 24

= 12345 x ( 17 + 23 + 1 + 35 + 24 )

= 12345 x 100

= 1234500

/HT\

a: \(\dfrac{12345\cdot98765-86420}{12345+12344\cdot98765}\)

\(=\dfrac{12344\cdot98765+98765-86420}{12345+12344\cdot98765}\)

\(=\dfrac{12344\cdot98765+12345}{12345+12344\cdot98765}=1\)

 (12345 x 235 + 235 x 12345 + 23451 ) x ( 11 x 9 - 99 )

= A x (99-99)

=  A x 0

= 0

bang 0

= 0 nha

k mk nha

\(12345\times17+24\times12345-12345=12345\times\left(17+24-1\right)=12345\times40=493800\)

12345 x 17 + 24 x 12345 - 12345

= 12345 x (17 + 24 -1)

= 12345 x 30 

= 370350.

3570:357-10=0 nha

mà số nào nhân với 0 cũng băng 0 

suy ra kết quả =0

HT

k cho mình nha

@@@@@@@@@@@

= 2469 + 10000

= 12469

=2469+10000

=12469

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

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

chúc bạn học tốt

\(=21,37\cdot\left(27,5+72,4+0,1\right)=21,37\cdot100=2137\)

=21,37⋅(27,5+72,4+0,1)=21,37⋅100=2137