7/8 + 7/8 ÷ 3/4

=  7/8 + 7/8 × 4/3

=  7/8 + (7×4)/(8×3)

=  7/8 + (7×4)/(2×4×3)

=  7/8 + 7/(2×3)

=  7/8 + 7/6

=   (7×3)/(8×3) + (7×4)/(6×4)

=   21/24 + 28/24

=   49/24

   (2³ - 127⁰)/(2⁻¹ + 3⁻¹)

=    (8 - 1) / (1/2 + 1/3)

=       7    /  (3/6 + 2/6)

=       7    /  (5/6)

=       7  × 6/5

=          42/5

    5 × (1 ÷ 5 × 6/9)

=   5 × (1/5 × 6/9)

=   5 × (6/45)

=    30/45

=     2/3