12 + 34 + 56 + 1 + 23 = 126

12 + 34+56+1+23= 34+56+12+1+23=90+13+23=103+23=126

lộn 126

B) (-11)+350+16+(-350 )

= - 11 + 350 + 16 - 350 )

= ( - 11 + 16 ) + ( 350 - 350 )

= 5 + 0 =5

C) (-10)+23+(-20)+30

= - 10 + 23 - 20 + 30

= ( - 10 - 20 + 30 ) + 23

= - 30 + 30 + 23

= 0 + 23 = 23

D) (456-123)+123

= 456 - 123 + 123 

= 456 

E) (-102)-(345-102)

= - 102 - 345 + 102

= ( - 102 + 102 ) - 345

= 0 - 345

= - 345

F) (12-34)-(34-8)

=  12 - 34  - 34 - 8

= (12 - 8 ) + ( -34 - 34 )

= 4 - 68 

= 64

 G) (12+34-56)-(12-56)

= 12 + 34 - 56 - 12 +56

= ( 12 - 12 ) + ( -56 + 56 ) + 34

= 0 + 0 + 34

= 34

Câu F k giống tính nhanh ____ Có thể là bạn gõ sai đề

@@ Học tốt @@
## Chiyuki Fujito

b ) (-11) + 350 + 16 + (-350) 

= (16 - 11 ) + ( 350 - 350 ) 

= 5 + 0 

= 5 

c)  (-10) + 23 + (-20) + 30

= 23 + ( 30 - 10 - 20 )

= 23 + 0 

= 23

d) ( 456 - 123 ) + 123

= 456 - ( 123 - 123 )

= 456 - 0 

= 456

e)  ( - 102 ) - ( 345 - 102 )

= - 345 - ( 102 - 102 ) 

= - 345 - 0 

= - 345

B) (-11)+350+16+(-350 )

= - 11 + 350 + 16 - 350 )

= ( - 11 + 16 ) + ( 350 - 350 )

= 5 + 0 =5

C) (-10)+23+(-20)+30

= - 10 + 23 - 20 + 30

= ( - 10 - 20 + 30 ) + 23

= - 30 + 30 + 23

Câu 1:

57x26+57x43+57x31

= 57x(26+43+31)

= 57x100

=5700

Câu 2:

177x 56- 56x56+ 121x44

= (177-56)x 56+ 121x44

= 122x56 + 121x44

= 121x(56+44)

=121x100

=12100

\(57.26+57.43+57.31\)

\(=57.\left(26+43+31\right)\)

\(=57.100\)

\(=5700\)

\(177.56-56.56+121.44\)

\(=56.\left(177-56\right)+121.44\)

\(=56.121+121.44\)

\(=121.\left(56+44\right)\)

\(=121.100\)

\(=12100\)

\(68.42+34.16\)

\(=34.2.42+34.16\)

\(=34.84+34.16\)

\(=34\left(84+16\right)\)

\(=34.100\)

\(=3400\)

14x56+6x34x2+24x7=2312

bạn ơi bằng 1360 nhé !

k cho mình 

14 x 56 + 6  x 34 x 2 + 24 x 7  = 1360

Tk mik nha mn

~~~Học tốt~~~

#keongotcute#

\(\left(x+34\right).2=56\)

          \(x+34=56\div2\)

          \(x+34=28\)

                      \(x=28-34\)

                      \(x=-6\)

(x+34) x 2=56

(x+34)=56:2

x+34=28

x=28-34

x=(-6)

(56+44) :2 x 5 

=100 : 2 x 5

=50 x 5 = 250

(56 + 44) : 2 X 5 =100:2x5=50x5=250

(56+44):2x5

= 100:2x5

=50 x 5

= 250

a) 12 + 23 + 34 + 45 + 56 + 67 + 78 + 89

= ( 12 + 78 ) + ( 23 + 67 ) + ( 34 + 56 ) + ( 45 + 89 )

= 90 + 90 + 90 + 132

= 90 x 3 + 132

= 270 + 132

= 402

b) 125 x 6 x 7 x 8

= 750 x 7 x 8

= 5250 x 8

= 42000

c) ( 56 x 78 + 56 x 47 ) : 7 

= 56 x ( 78 + 47 ) : 7

= 56 x 125 : 7

= 7000 : 7

= 1000

a) 12 + 23 + 34 + 45 + 56 + 67 + 78 + 89

= ( 12 + 78 ) + ( 23 + 67 ) + ( 34 + 56 ) + ( 45 + 89 )

= 90 + 90 + 90 + 132

= 90 x 3 + 132

= 270 + 132

= 402

b) 125 x 6 x 7 x 8

= 750 x 7 x 8

= 5250 x 8

= 42000

c) ( 56 x 78 + 56 x 47 ) : 7 

= 56 x ( 78 + 47 ) : 7

= 56 x 125 : 7

= 7000 : 7

= 1000

\(34\times76+66\times110+34\times34\)

\(=34\times\left(76+34\right)+66\times110\)

\(=34\times110+66\times110=110\times\left(34+66\right)=110\times100=110000\)

34 x 76 + 66 x 110 + 34 x 34

= 34 x ( 76 + 34 ) + 66 x 110

= 34 x 110 + 66 x 110

= 110 x ( 34 + 66 )

= 110 x 100

= 11 000

=))

34 x 76 + 66 x 110 + 34 x 34

= 34 x ( 76 + 34 ) + 66 x 110

= 34 x 110 + 66 x 110

= 110 x ( 34 + 66 )

= 110 x 100 

= 110000

Study well 

Bạn k k lên điểm đâu lên mk k cần đâu ạ 

M = 1 +2 -3 -4 +5 +6 -7 -8 +9 +....+994 -995 -996 +997 +998

M = 1 +(2 +5 -3 -4) + (6 +9 -7 -8)+....+(994 +997 -995 -996) +998

M = 1 +0 +0 +....+0 +998

M = 999.