Question

Tính bằng cách thuận tiện nhất :

7,89 x 54 - 7,89 x 54 - 7,89

Answer 1

\(7,89\times54-7,89\times54-7,89\)

\(=7,89\times\left(54-54\right)-7,89\)

\(=7,89\times0-7,89\)

\(=0-7,89\)

\(=-7,89\)

Answer 2

 = 0 - 7,89 = -7,89

k mk nha

Answer 3

7,89.54-7,89.54-7,89

=(7,89.54-7,89.54)-7,89

=0-7,89=-7,89

Answer 4

=7,89x54-7,89x54-7,89x1

=7,89x(54-54-1)

=7,89x-1

=-7,89

Answer 5

7,89 x ( 54 - 54 ) - 7,89

= 7,89 x 0 - 1,89

= 0 - 7,89

= - 7,89

Answer 6

7,89 nhé

Answer 7

7,89 x 54 - 7,89 x 54 - 7,89

=7,89 x 54 - 7,89x 54- 7,89 x 1

= 7,89x [ 54-54-1]

= 7,89x[0-1]

= 7,89x -1

=   -7,89

Answer 8

Mình chưa hoc số âm ạ