5)
Упростим выражения в скобках:
10⁴/₂₇+77/27=274/27+77/27=351/27=13.
11²/₄₃-7⁸/₄₃=475/43-309/43=166/43.⇒
20¹/₄₃-13-166/43=861/43-166/43-13=695/43-13=16⁷/₄₃-13=3⁷/₄₃.
6) 83/12+13/59-4/59+1/12=84/12+9/59=7+9/59=7⁹/₅₉.
<span>12/19 * (1 7/12 * 4 13/21) =
12/19 *(19/12 * 4 13/21) =
(12/19*19/12) * 4 13/21 =
1 * 4 13/21 = 4 13/21,
(3 2/7 * 25,8) * 7/23 =
(23/7 * 25,8) * 7/23 =
(23/7 * 7/23) * 25,8 =
1 * 25,8 = 25,8</span>