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

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

\(=123\times100\)

\(=12300\)

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

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

\(22< n< 24\)

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

x*123=12

x       = 12:123

x       =  4/41 

tk mk nha

\(x\times123=12\)

\(x=12\div123\)

\(x=\frac{4}{41}\)

X x 123 = 12

X = 12 : 123

X = \(\frac{4}{41}\)

~~ tk mk nha ~~ T_T

Xin các bn đó ~~ Y_Y

Làm ơn đi Y_Y

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

\(20.3=60\)

\(90.1=90\)

\(123-123=0\)

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

\(23-5=15\)

\(123+12=135\)

\(1000-200=800\)

\(333-111=222\)

12 x X = 123 x 123 + 409

12 x X = 15129 + 409

12 x X = 15538

X = 15538 : 12

X = \(\dfrac{7769}{6}\)

\(12.X=123.123+409\)

\(12.X=15129+409\)

\(12.X=15538\)

\(X=15538:12\)

\(X=\dfrac{7769}{6}\)

Vậy \(X=\dfrac{7769}{6}\)

Ghi chú 12 . X = 12 x X

7769/6

x =  [{(15129 x 123 ) : 123 } :123] : 123

x = 1

X=0 nha bạn

x + 123 = 123 - 123 + 123

x + 123 = 123

x = 123 - 123

x = 0

x + 123 = 123 - 123 + 123

x + 123 =0 + 123

x + 123 =123 

x = 123 - 123 

x = 0

K MIK NHÉ!

x + 123 = 123 - 123 + 123

x = 123 - 123 + 123 - 123

x = 0