1/3[1/2(1/4-1/3)+1/6]

1/3[1/2(-1/12)+1/6]
1/3[-1/24+1/6]
1/3[-1/24+4/24]
1/3(3/24)
1/3(1/8)
1/24

1/3×[1/2×(-1/12)+4/24]
1/3×[-1/24+4/24]
1/3×3/24
1/24
maaf yg ada digambar salah itu yg benar