-1911-(1234-1911)= -1234

-1911-(1234-1911)

= -1911-1234+1911

= [(-1911)+1911]-1234

= 0-1234

=-1234

-1911-(1234-1911)

=-1911-1234+1911

=(-1911+1911)-1234

=0-1234

=-1234

-1911(1234-1911)

= -1911. (- 677)

= 1293747

-1911( 1234 - 1911)

= -1911 . (-677)

=1293747

Cách 1: \(-1911\left(1234-1911\right)\\ =-1911\cdot\left(-677\right)\\ =1293747\)

Cách 2: \(-1911\left(1234-1911\right)\\ =-1911\cdot1234-\left(-1911\right)\cdot1911\\ =-2358174-\left(-3651921\right)\\ =-2358174+3651921\\ =1293747\)

b.-1911-1234+1911=-1911+1911-1234=0-1234=-1234

c.-15.(29+71)=-15.100=-1500

d.156.(72+28)=156.100=15600

a,-1911-(1234-1911)

=>-1911-1234+1911

=>-1234

b,32.(-39)+16.(-22)

=>16.2.(-39)+16.(-22)

=>16.(-78)+16.(-22)

=>16.(-100)

=-1600

li-----------ke nha 

a. -1911-(1234-1911)

=-1911-1234+1911

=(-1911+1911)-1234

=0-1234=-1234

b.32.(-39)+16.(-22)

=16.2.(-39)+16.(-22)

=16.(-78)+16.(-22)

=16.{(-78)+(-22)}

=16.(-100)

=-1600

27.(-3-(-4)=27.1=27

a) 27. ( 13 - 16 ) - 16.( 13 - 27 )

= 27.13 - 27.16 - 16.13 - 16.27

= 27.13 - 16.13

=13.( 27 - 16 )

= 13 . 11

= 143

b) -1911 - ( 1234 - 1911 )

= -1991 + ( -1234 ) + 1911

= -1234

=500x(5956+458+3568+1)

=500x9983 hay 9982 j đó thì ko biết

=?

kết quả bảng 5004500 mới đúng

5956x500+458x500+3568x500

=(5956+458+3568) x 500

=9982 x 500

=4991000

Hình như bạn tính sai

4x51x7+2x86x7+12x2x7=

(4 x7)x51+(2x7)x86+(2x7)x12=

28x51+14x86+14x12=

14x2x51+14x86+14 x12=

14x102+14x86+14x12=

14x(102+86+12)=

14x200=

2800

4x51x7+2x86x7+12x2x7

(4 x7)x51+(2x7)x86+(2x7)x12

28x51+14x86+14x12

14x2x51+14x86+14 x12

14x102+14x86+14x12

14x(102+86+12)

14x200

2800

=4x51x7+2x86x7+12x2x7

=(4 x7)x51+(2x7)x86+(2x7)x12

=28x51+14x86+14x12

=14x2x51+14x86+14 x12

=14x102+14x86+14x12

=14x(102+86+12)

=14x200

2800