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

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

\(20.3=60\)

\(90.1=90\)

\(123-123=0\)

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

\(23-5=15\)

\(123+12=135\)

\(1000-200=800\)

\(333-111=222\)

(123x456-23x46)x(12x9-4x27)

=.......x.....

=0

( 123 * 456 - 23 * 46) * (12 * 9 - 4 * 27) = 55030 * 0

                                                        = 0.

( 123 . 456 - 23 . 46 ) . ( 12 . 9 - 4 . 27)

= ( 123 . 456 - 23 . 46 ) . ( 108 - 108 )

= ( 123 . 456 - 23 . 46 ) . 0

= 0

( 123 . 456 - 23 . 16 ) . ( 12 . 9 - 4 . 27)

= ( 56088 - 368) . ( 108 - 108 )

= 55720 . 0

= 0

( 123 x 456 - 23 x 16 ) x ( 12 x 9 -4 x 27 )

=( 123 x 456 - 23 x 16 ) x (108 -108)

=( 123 x 456 - 23 x 16 ) x 0=0

( 123 x 456 - 23 x 16 ) x ( 12 x9 - 4 x 27 )  = ( 123 x 456 - 23 x 16 ) ( x 108 - 108 ) 

                                                               =  557 / 0 

                                                               = 0

Chúc bạn học tốt Kane thân mến ! 

a: =6/35x39/54=13/105

b: \(=\dfrac{-5}{7}\left(\dfrac{2}{11}+\dfrac{9}{11}\right)+\dfrac{12}{7}=\dfrac{-5}{7}+\dfrac{12}{7}=1\)

\(12+23>23:23\)

\(123-123=22-22\)

\(13-6< 23\)

\(90-3>24\)

12+23>23:23     13-6<23

123-123=22-22     90-3>24

.

Trả lời:

12 + 23 > 23 : 23

123 - 123 = 22 - 22

 13 - 6 < 23 

90 - 3 > 24

\(123+123+12+23=281\)

\(12+34-2=44\)

K mình nha mình sẽ k bạn thề luôn!

123 + 123 + 12 + 23

= 123 x 2 + 35

= 281

a) =281

b) =44

a: -23-12=-(23+12)=-35

a: -100-12=-(100+12)=-112

a: -123-20=-(123+20)=-143

a: 43-(-53)=43+53=96

a: 14-(-20)=14+20=34

a: -15-(-17)=-15+17=17-15=2

a: 143-(-123)=143+123=266

b: 12-(5-7)=12-(-2)=12+2=14

b: 15-(-9)-4=11+9=20

b: -17-(8-25)=-17-8+25=-25+25=0

b: -5+10-12-5=(10-5-5)-12=0-12=-12

b: (1456+23)-1456=1456-1456+23=0+23=23

b: (2354-45)-2354=2354-45-2354=-45

b: -2021-(57-2021)=-2021-57+2021=-57

c: 283+581-282-531=(283-282)+(581-531)=50+1=51

c: 3758+57-3769-66

=(3758-3769)+(57-66)

=(-11)+(-9)

=-(11+9)

=-20

c: 2575+37-2575+29

=37+29

=66

c: 17+33+(-37)+(-33)

=(17-37)+(33-33)

=0+(-20)

=-20

c: -4+(-10)+25+(-11)

=(-4-10-11)+25

=25-25

=0

c: 42-69+17+(-42)-17

=(42-42)+(17-17)+(-69)

=-69

c: (-2)+(-370)+(-8)+370

=(-2-8)+(-370+370)

=-10+0

=-10