= 54x275+275x(3x15)+275
= 54x275+ 275x45+275
= 275x(54+45+1)
= 275x100
= 27500
54 x 275 + 825 x 15 + 275
= 54 x 275 + 275 x 45 + 275
= 275 x ( 54 + 45 + 1 )
= 275 x 100
= 27500
54 x 275 + 825 x 15 + 275
= 54 x 275 + 45 x 275 + 275
= 275 x ( 54 + 45 + 1)
= 275 x 100
= 27500
ủng hộ mk nha!!!! ^_^