123 × 97 + 2 × 123 + 123 = 123 x ( 97 + 2 + 1) = 123 x 100 = 12300

123 x 97 + 2 x 123 + 123 

= 123 x 97 + 2 x 123 + 123 x 1 

=   123 x ( 97 + 2 +1 ) 

=  123 x 100 

=  12300.

                  N H Ớ   T I C K   C H O   M  Ì  N   H     N  H  A  

                             ~ HT~

=123x10=1230

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

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

`123 xx 137 - 123 xx 36 - 123`

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

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

`=123xx100`

`=12300`

123 x 54 + 123 x 46

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

= 12300

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

                               = 123 x       100

                               =           12300

có sai đề bài k?

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 #

123.75+123.24+123

=123.(75+24+1)

=123.100

=12300

a) 98 + 3 + 97 +2

= (98 +2) + ( 97 + 3)

= 100 + 100 = 200

56 + 399 + 1 + 4

= (56 + 4) +( 399 + 1)

= 60 + 400 = 460

b) 364 + 136 + 219 + 181

= (364 + 136) + (219 + 181

= 500 + 400 = 900

178 277 + 123 + 422

= (178 + 422) + (277 + 123)

= 600 + 400 = 1000

2785:123+2750:123

=(2785+2750):123

=5535:123

=45

Trl :

2 785 : 123 + 2 750 : 123

= ( 2 785 + 2 750 ) : 123

=          5 535          : 123

= 45

#Jun'z

~ HT ~

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