12 x 45 + 12 x 55

= 12 x (45 + 55)

= 12 x 100

= 1200

Ủng hộ mk nha ^_-

12 x 45 + 12 x 55

= 12 x ( 45 + 55 )

= 12 x 100

= 1200

12 x ( 45 + 55 ) 

12 x 100

= 1200

k mk nha!!!!

12+12=24

45+45=90

63+26=89

54+55=109

12 + 12 = 24

45 + 45 = 90

54 + 55 = 109

12 . 12 + 45 + 55

= 144 + (45 + 55)

= 144 + 100

= 244

= ( 12 x 12 ) + ( 45 + 55 ) 

= 144 + 100

= 244

Nhớ k cho mình nhé!

12 . 12 + 45 + 55

= 144 + (45+55)
= 144 + 100

= 244.

248

nghĩa trần và các bạn xinh đẹp,học giỏi k cho mk nha

mk nhanh nhất

248 nha bn

248

\(\left(\left|\left(-45\right)+50\right|+\left|-55\right|\right):12+\left|-2015\right|\)

\(=\left(\left|-45+50\right|+\left|-55\right|\right):12+\left|-2015\right|\)

\(=\left(\left|-\left(45-50\right)\right|+\left|-55\right|\right):12+\left|-2015\right|\)

\(=\left(\left|-\left(-5\right)\right|+\left|-55\right|\right):12+\left|-2015\right|\)

\(=\left(\left|5\right|+\left|-55\right|\right):12+\left|-2015\right|\)

\(=\left(5+55\right):12+\left|-2015\right|\)

\(=60:12+\left|-2015\right|\)

\(=5+\left|-2015\right|\)

\(=5+2015\)

\(=2020\)

1) -1

2) -1326

3) 90

= 11/12 - 22/5

= 31/60

a) -(12+21-23)-(23-21+10)

 =-12-21+23-23+21-12=-12-12=-24

b)(57-725)-(605-53)

 =57-725-605+53=-1220

c)(55+45+45)-(15-55+45)

 =55+45+45-15+55-45=110+45-15=140

-(12+21-23)-(23-21+10)

=-12-21+23-23+21-10

=(21-21)+(23-23)-(12+10)

=0+0-22=-22

(57-725)-(605-53)

=57-725-605+53

=(57+53)-(725+605)

=110-1330

=-1220 

(55+45+45)- (15-55+45)

=55+45+45-15+55-45

=(45+55)+(55-15)+(45-45)

=100+40+0=140

-(12+21-23) - (23-21+10) = -12 - 21 + 23 - 23 + 21 - 10 = (-12-10) + (21-21) + (23-23) = -22 + 0 + 0 = -22

(57 - 725) - (605 - 53) = 57 - 725 - 605 + 53 = (57 + 53) - (725 + 605) = 110 - 1330 = 1220

(55 + 45 + 45) - (15 - 55 + 45) = 55 + 45 + 45 - 15 + 55 - 45 = (55 + 55) + (45 - 45) + (45 - 15)

= 110 + 0 + 30 = 140

a) ( 12 + 21 - 23 ) - ( 23 - 21 + 10 )

  = 12 + 21 - 23 - 23 - 21 + 10

  = ( 12 + 10 ) - ( 21 - 21 ) - ( 23 - 23 )

  =        22      -        0        -        0

  =                          22

b) ( 55 + 45 + 15 ) - ( 15 - 55 + 45 )

  = 55 + 45 + 15 - 15 - 55 + 45

  = ( 55 + 45 ) + ( 55 + 45 ) + ( 15 - 15)

  =       100      +      100      +      0

  =                          200

\(a)\)\(-\left(12+21-23\right)-\left(23-21+10\right)\)

 \(=-12-21+23-23+21-10\)

 \(=\left(-21+21\right)+23-23-12-10\)

 \(=0+0-12-10\)

 \(=-22\)

\(b)\)\(\left(55+45+15\right)-\left(15-55+45\right)\)

  \(=55+45+15-15+55-45\)

  \(=\left(15-15\right)+\left(45-45\right)+55+55\)

  \(=0+0+55+55\)

  \(=110\)

a) = 22

b) =200