Question

[Vũ Nguyên Hạnh]

tính nhanh:

a) 85.(35-27) - 35.(85-27) =

b) 47.(45-15) - 47.(45+15) =

Answer 1

[nagisa]

a)85.(35-27)-35.(85-27)

=85.35-27-35.85-27

=(85-85).(35-35).(27-27)

=0.0.0

=0

b)47.(45-15)-47.(45+15)

=47.45-15-47.45+15

=(47-47).(45-45).(15+15)

=0.0.30

=0

Answer 2

[Đỗ Mai Vy]

a) - 1350

b) - 141o