Вычислить : 1) (11cos287-25sin557)/sin170=2)(2cos11π/5+8sin13π/10)/cosπ/5= 3)(cos105*cos5+sin105*cos85)/(sin195*cos5+cos195*sin185) - id305022420210608 от JuliaPetrova56 08.06.2021 06:36

Question

Алгебра: Вычислить : 1) (11cos287-25sin557)/sin170=2)(2cos11π/5+8sin13π/10)/cosπ/5= 3)(cos105*cos5+sin105*cos85)/(sin195*cos5+cos195*sin185)

JuliaPetrova56 · Accepted Answer

6x-6y=12 -6x+24y=6 (6x-6y)+(-6x+24y)=12+6 6x-6y-6x+24y=18     18y=18 y=1
-2x+4=1     -2x=-3 x=1.5

Вычислить : 1) (11cos287-25sin557)/sin170=2)(2cos11π/5+8sin13π/10)/cosπ/5= 3)(cos105cos5+sin105cos85)/(sin195cos5+cos195sin185)