11/12 - 3/5 : 27/25 =
11/12 - 3/5 x 25/27 =
11/12 - 5/9 =
(66 - 40)/72 =
26/72 =
13/36
4√3 (5√7 + 2√3) =
4√3 × 5√7 + 4√3 ×2√3 =
20√21 + 8×3 =
20√21 + 24
(4√3 - 3√2) (7√3 - 5√2) =
4√3×7√3 - 4√3×5√2 - 3√2×7√3 + 3√2×5√2 =
28×3 - 20√6 - 21√6 + 15×2 =
84 - 41√6 + 30 =
114 - 41√6
(8√5 + 3√2)² =
(8√5)² + 2×8√5×3√2 + (3√2)² =
64×5 + 48√10 + 9×2 =
320 + 48√10 + 18 =
338 + 48√10
