Question

a) 25. (32 + 47 ) - 32. (25 + 47 )

b) 48 . (21 -19 ) - 21 . (48 - 19 ) + 27 .(-81)  

Answer 1

a/ 25 x ( 32 + 47 ) - 32 x ( 25 + 47 )

= 25 x 79 - 32 x 72

= 1975 - 2304

= -329

b/ 48 x ( 21- 19 ) - 21 x ( 48 - 19 ) + 27 x ( -81 )

= 48 x 2 - 21 x 29 + 27 x ( -81 )

= 96 - 609 + -2187

= -2700

Answer 2

cau co phai vu phuong huyen ko.Neu phai thi cau hay vao ket ban voi to

Answer 3

a) 25.(32+47)-32.(25+47)

=25.32+25.47-32.25+32.47

=32.(25-25-47)+25.47

=32.(-47)+25.47

=47.((-32)+25)

=47.(-7)

=-329.

b) làm tương tự phần a bạn nha.

Answer 4

a) 25. (32 + 47 ) - 32. (25 + 47 )

=

 25.32 + 25.47 - 32.25 - 32.47 

=

(

25.32

 - 

32.25

) 

+

 

(

25.47 - 32.47)

=  0 + (25-32).47

=           -7     .47

=    -329               

Answer 5

a, 25. ( 32 + 47 ) - 32. (25 + 47 )

= ( 25 . 32 - 32 . 25 ) + ( 25 . 47 - 32 . 47 )

= 0 + [ 47 . ( 25 - 32 )]

= 47 . ( -7 )

= - 329