(2/3 + 4/7) ×42 = 2/3 × 42 + 4/7 × 42 = 2×14 + 4×6 = 28+24 = 52.
2/3×42/1 + 4/7×42/1 =
= 2/1×14/1 + 4/1 × 6/1 =
= 28/1 + 24/1 =
= 28+24 = 52
