36x47+33x36+9x80=1692+1188+720
= 2880+720
= 3600 nhé
HT
36x47+33x36+9x80
=36x(47+33)+9x80
=36x80+9x80
=80x(36+9)
=80x45
=3600
Bru, sao sai hết thế zậy???????
36x47+33x36+9x80
=36x47+33x36+9x4x20
=36x47+33x36+36x20
=36x(47+33+20)
=36x100
=3600
~HT~