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

=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 54 + 123 x 46

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

= 12300

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

6705+670x123-670x23

= 670x(123-23)+6705

=670x100+6705

=67000+6705

=73705

2917x85-2817x35

=2917x(85-35)

=2917x50

=145850

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 !!! 

tính bằng cách thuận tiện nhất :

100 x 55 + 100 x 45 x 10

= 100 x 55 + 100 x 45 x 10

= 100 x 55 + 100 x 450

= 100 x ( 55 + 450 )

= 100 x 500

= 50000

100x55+100x45x100

=100x(55+45)x10

=100x100x10

=1000x10

=10000

       Các bn k mik nha

100*55+100*45*10

=(100*55)+(100*45)*10

=(5500+4500)*10

=10000*10

=100000

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.

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                             ~ HT~