penyelesaian 1/3x 4/3(2/3-1/7)²

= 1/3 x 4/3 x (2/3-1/7)²
= 1/3 x 4/3 x (11/21)²
= 1/3 x 4/3 x 121/441
= 484/3969 = 0.121945

maaf kalo salah atau kurang lengkap