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.
5х+11х = -1 + 1/6 - 8/3
16х = -6 + 16 + 1
16х = 11
Х= 0,6875