Question

1 Tinh bang cach thuan tien 

 a 25+ 69+75+11

b 64*867+36*867

c 25*989*4+25

Answer 1

a) 25 + 69 + 75 + 11

= (25 + 75) + (69 + 11)

= 100 + 80

= 180

b) 64 x 867 + 36 x 867

= (64 + 36) x 867 

= 100 x 867

= 86700

c) 25 x 989 x 4 + 25

= 25 x 4 x 989 + 25

= 100 x 989 + 25

= 98900 + 25

= 98925

Answer 2

a)25 + 69 + 75 + 11 

=(25 + 75) + (69 + 11)

=100 + 80

=180

b)64 * 867 + 36 * 867

=(64 + 36) * 867

=100 * 867

=86700

c)25 * 989 * 4 +25

=25*3956+25

=25*(3956+1)

=25*3957

=98925

Answer 3

(25+75)+(69+11)

Answer 4

a) 25+69+75+11

=(25+75)+(69+11)

=100 + 80

=180

b)64x867+36x867

=(64+36)x867

=100x867

=86700

c)25x989x4+25

=(25x4)x989+25

=100x989+25

=98900+25

=98925

nếu thấy đúng kick dùm mk nhé