3 x 4 + 12 x 19 + 6 x 66 x2
= 12 + 12 x 19 + 6 x 66 x2
= 12 x ( 1 +19 ) + 6 x 66 x2
= 12 x 20 + 6 x 2 x 66
= 12 x 20 + 12 x 66
= 12 x ( 20 + 66 )
= 12 x 86
=1032
k mik nha bn
\(3\times4+12\times19+6\times66\times2\) 2 gì phải không
3 x 4 + 12 x 19 + 6 x 66 x 2
=12 +12 x 19 + 6 x 2 x 66
=12 x 1 + 12 x 19 + 12 x 66
=12 x (1 + 19 + 66)
=12 x 86
=1032