=123x10=1230

\(=123\times\left(6+3+1\right)\)
\(=123\times10\)
\(=1230\)

\(123\times6+123+3\times123\\ =123\times\left(6+1+3\right)\\ =123\times10\\ =1230\)

`123 xx 137 - 123 xx 36 - 123`

`= 123 xx 137-123xx36-123xx1`

`=123xx(137-36-1)`

`=123xx100`

`=12300`

$#flo2k9$

`123 xx 137 - 123 xx 36 - 123`

= `123 xx ( 137 - 36 - 1 )`

= `123 xx 100`

= `12300`

\(123\times137-123\times36-123=123\times\left(137-36-1\right)=123\times100=12300\)

 123 x 45 x 55 x 123 = 123 x ( 45 + 55 )

                               = 123 x       100

                               =           12300

có sai đề bài k?

 123 x 45 x 55 x 123 = 123 x ( 45 x 55 )

                                 = 304425

\(a,123\times54+27\times123-12\times123+123\times31\)

\(=123\times\left(54+27-12+31\right)\)

\(=123\times100\)

\(=12300\)

\(b,\dfrac{121}{27}\times\dfrac{54}{11}< n< \dfrac{100}{21}:\dfrac{25}{126}\)

\(22< n< \dfrac{100}{21}\times\dfrac{126}{25}\)

\(22< n< 24\)

Vì \(23>22\) và \(23< 24\) nên \(n=23\)

a, 123x(54+27-12+31)

=123x100

=12300

a123x54+27x123-12x123+123x31

=123:54+27:123-12:123+123:31

=6642+27:123-12:123+123:31

=6642+3321-12:123+123:31

=6642+3321-1476+123:31

=6642+3321-1476+3813

=12300

b,121/27x54/11<n>100/21:25/126

=22<n>24

n=23

mình đag cần gấp

123+45x123+54x123
= 123x(1+45+54)
= 123x100
= 12300
144x25x36
= 3600x36
= 129600

123+45x123+54x123
= 123x(1+45+54)
= 123x100
= 12300
144x25x36
= 3600x36
= 129600

12,3 x 6 + 123 x 0,1 + 1,23 x 50 - 24,6

= 12,3 x 6 + 12,3 + 12,3 x 5 - 12,3 x 2

= 12,3 x (6 + 1 + 5 - 2)

= 12,3 x 10

= 123

Tính bằng cách thuận tiện :

 37 x 68 + 123 x 74

= 37 x 68 + 123 x 2 x 37

= 37 x 68 + 246 x 37

= 37 x ( 246 + 68 )

= 37 x 314

= 11618

37 x 68 + 123 x 74 

= 37 x 68 + 123 x 2 x 37 

= 37 x 68 + 37 x 246 

= 37 x ( 68 + 246 ) 

= 37 x 314 

= 11618 

37 x 68 + 123 x 74 

= 37 x 2 x 34 + 123 x 74 

= 74 x 34 + 123 x 74

= 74 x ( 34 + 123 ) 

= 74 x  157

= 11618

Chúc bạn học tốt !!!