1*2+2*4+3*3*2
1*2+2*4+9*2
2*(1+4+9)
2*14
28
câu b tương tự nhé
1x2+2x4+3x6 / 2x3+4x6+6x9 = 2x1+2x4+3x2+3x2+3x2 / 6+4x6+6x9 = 2x(1+4+3+3+3) / 6x(1+4+9)
=2x14 / 6x14=2/6=1/3
1 x 2 + 2 x 4 + 3 x 6
1 x 2 + 2 x 4 + 3 x 3 x 2
1 x 2 + 2 x 4 + 9 x 2
2 x ( 1 + 4 + 9 )
2 x 14
28
2 x 3 + 4 x 6 + 6 x 9
2 x 3 + 2 x 2 x 6 + 2 x 3 x 9
2 x 3 + 2 x 12 + 2 x 27
2 x ( 3 + 12 + 27 )
2 x 42
84
k cho mk nha