Question

tính hợp lý :-25.72+25.21-49.25

Answer 1

-25.72+25.21-49.25

=25.(-1).72+25.21-49.25

=25.(-72)+25.21-49.25

=25.(-72+21-49)

=25.(-100)

=-2500

Answer 2

-25.72 + 25.21 - 49.25 = 25.(-72) + 25.21 - 49.25 = 25.(-72 + 21 - 49) = 25.(-100) = -2500