=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`

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

Tính nhanh:

 1+2+3+4+5+6+7+8+9+10

=(1+9)+(2+8)+(3+7)+(4+6)+10+5

=  10  +  10  +  10   + 10  + 10+5

=             50   +   5

=    55

123*45+123*50+123*5

=  123*(45+50+5)

=   123 * 100

=   12300

K mk nha bn

1+2+3+4+5+6+7+8+9+10

= ( 1+10 ) + ( 2+9) + (3+8) + (4+7) + (5+6)

=     11    +      11   +   11    +   11  +    11

=11 x 5 

=55

123 x 45 + 123 x 50 + 123 x 5 

= 123 x ( 45 + 50 +5 )

= 123 x 100

=12300

hok tốt .

1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 10 : 2 x 11 = 55

123 x 45 + 123 x 50 + 123 x 5 = 123x ( 45 + 50 + 5) = 123 x 100 = 12300

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

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

\(=123\times100\)

\(=12300\)

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

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

\(22< n< 24\)

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

 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

123 x 54 + 123 x 46

= 123 x (54 +46) = 123 x 100

= 12300

123 x 4 + 123 x 6 + 123 x 9 + 123

= 123 x 4 + 123 x 6 + 123 x 9 + 123 x 1

= 123 x (4 + 6 + 9 + 1)

= 123 x 20

= 2460

Đáp số : 2460

123 x 4 + 123 x 6 + 123 x 9 +123
= 123 x 4 + 123 x 6 + 123 x 9 +123 x 1
= 123 x (4 + 6 + 9 + 1)
= 123 x 20
= 2460

123x4 +123x6 +123x9 +123

=123 x4 +123x6+ 123x9 +123 x1

=123x (4+6+9+1)

=123x 20

=2460

123×45+123×55

=123×(45+55)

=123×100

=12300

56×4+56×3+56×2+56

=56×4+56×3+56×2+56×1

=56×(4+3+2+1)

=56×10

=560

[ 123×154-65×123]:89

=[123×(154-65)]:89

= 123×89:89

=123×(89:89)

=123×1

=123

123 x 45 + 123 x 55

= 123 x ( 45 + 55 )

= 123 x 100

= 12300

56 x 4 + 56 x 3 + 56 x 2 + 56

= 56 x ( 4 + 3 + 2 + 1 ) 

= 56 x 10

= 560

[ 123 x 154 - 65 x 123 ] : 89

= [ 123 x ( 154 - 65 ) ] : 89

= [ 123 x 89 ] : 89

= 123

Học tốt #

123 x 45 + 123 x 55

= 123 x ( 45 + 55 )

= 123 x 100

= 12300

56 x 4 + 56 x 3 + 56 x 2 + 56

= 56 x ( 4 + 3 + 2 + 1 )

= 56 x 10

= 560

[123 x 154 - 65 x 123] : 89

= [ 123 x ( 154 - 65 ) ] : 89

= [ 123 x 89 ] : 89

= 123 x 89 : 89

= 123