Question

Thực hiện phép tính 

a, 53 . ( - 15). + ( - 15 ) . 47

b, 43 . ( 53 - 81) + 53 . ( 81 - 43 )

c, ( - 5 ) . 8 + ( - 2) . 3

d, 3 . ( - 4)² + 2 . ( - 5) - 20

 

Answer 1

a, 53.(-15)+(-15).47

=(-15)(53+47)

=(-15).100

=-1500

b, 43.(53-81)+53.(81-43)

=43.(-28)+53.38

=810

c,(-5).8+53.(81-43)

=-45+53.38

=1969

d, ban tu giai nốt

Answer 2

a,-15 . (53+47)

 = -15 . 100

=-1500

b,43.53-43.81+53.81-43.53

=(43.53-43.53)+81.(-43+53)

= 0 + 81.10

=0+810

=810

c,-40+-8

=-48

d,3.16+(-10)-20

=48+(-10)-20

=38-20

=18

Answer 3

a) 53 . (-15) + (-15) . 47

= (53 + 47) . (-15)

= 100 . (-15) 

= -1500

b) 43 . (53 - 81) + 53 . (81 - 43)

= 43 . (-28) + 53 . 38

= -1204 + 2014

= 810

c) (-5) . 8 + (-2) . 3

= (-5) . (-2) . (-4) + (-2) . 3

= 20 . (-2) + (-2) . 3

= (20 + 3) . (-2)

= -46

d) 3 . (-4)² + 2 . (-5) - 20

=  3.16 + (-10) - 20

= 18

k cho tớ nha bn

Answer 4

moi nguoi can phai giai thich di chu

Answer 5

các bạn làm đúng rồi