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

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

\(=123\times100\)

\(=12300\)

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

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

\(22< n< 24\)

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=123.(12-1)

123-x=123.11

123-x=1353

        x=1353:123

        x=11

vậy x=11

Bài làm

123 - x = 123 . ( 12 - 1 )

123 - x = 123 . 11

123 - x = 1353

         x = 123 - 1353

         x = -1230

Vậy x = -1230

# Học tốt #

123 - x = 123 . (12 - 1)

123 - x = 123 . 11

123 - x = 1353

         x = 1353 - 123

         x = 1230

12 : 3 = 4 x 4 = 16

20 x 3 = 60

90 : 1 = 90

123 - 123 = 0

10 x 9 = 90 : 9 = 10

12 - 9 = 3 x 9 = 27

23 - 5 = 18

123 + 12 = 135

1000 - 200 = 800

333 - 111 = 222

\(20.3=60\)

\(90.1=90\)

\(123-123=0\)

\(10.9=\frac{810}{9}=90\)

\(23-5=15\)

\(123+12=135\)

\(1000-200=800\)

\(333-111=222\)

123 + 123 + 23 +12 = 281

12 x 4 =48

ai qua nhớ cho mk nha ^_-,cảm ơn cac bn nhìu

123+123+23+12=281

12x4=48 nha 

123 + 123 +23+12=281

12 x 4 =48

123+12x123+48

=123x(12+48)

=123x60

=7380

123 + 123 = 246

x + 12 = 34

x        = 34 - 12

x       =22

\(123+123=246\)

\(x+12=34\)

           \(x=34-12\)

           \(x=22\)

123+ 321= 444

x+12=34

     x=34-12

     x= 22

123 + 123 = 246

12 x 2 = 24 

90 x 2 = 180

ủng hộ nha ^_-

câu 1 :=246                                 câu2 = 24                                                          câu3 = 180                         chọn mình nha

= 246

= 24 

= 180