СРОЧНО ПОМОГИЕТЕ С 1 И 3.
1/ x≠0 2/ x²-5x-14>0 корни (Виет) 7 и -2 ------------------ -2---------------------------7----------------------- + - + x∈(-∞;-2)∪(7;∞) #3 31π/4=32*π/4-π/4=8π-π/4=4*2π-π/4=-π/4= -45° -10π/3=-6π/3-4π/3=-2π-4π/3=-4π/3= -240°=120°