1) D(y)=R или (-∞; +∞)2) 6x²+x-1≥0 D=1+24=25 x₁=(-1-5)/12=-6/12=-1/2 x₂=(-1+5)/12=4/12=1/3 + - +-------- -1/2 ------------ 1/3 -------------\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\D(y)=(-∞; -1/2]U[1/3; +∞)3) 2x²+3x-5>0 D=9+40=49 x₁=(-3-7)/4=-2.5 x₂=(-3+7)/4=1 + - +-------- -2.5 ------------ 1 ---------------\\\\\\\\\\\ \\\\\\\\\\\\\\\\\\D(y)=(-∞; -2.5)U(1; +∞)4) 3x-5x²≥0 5x²-3x≤0 5x(x-3/5)≤0 x(x-0.6)≤0x=0 x=0.6 + - +----------- 0 ----------- 0.6 ------------ \\\\\\\\\\\\\D(y)=[0; 0.6]5) 3x²+5x-2≠0 D=25+24=49 x₁≠(-5-7)/6≠ -2 x₂≠(-5+7)/6=2/6≠1/3D(y)=(-∞; -2)U(-2; 1/3)U(1/3; +∞)6) 1) x-7≠0 x≠72)

(11+x)(x-7)≥0(x+11)(x-7)≥0x= -11 x=7 + - +-------- -11 ----------- 7 -------------\\\\\\\\\\ \\\\\\\\\\\\\\\D(y)=(-∞; -11]U(7; +∞)7) (64-x)(x+2)(3x-x²)≥0 -(x-64)(x+2)*(-(x²-3x))≥0 (x-64)(x+2)(x²-3x)≥0 x(x-64)(x+2)(x-3)≥0x=0 x=64 x=-2 x=3 + - + - +-------- -2 ---------- 0 --------- 3 ------------ 64 ----------\\\\\\\\\\ \\\\\\\\\\\\ \\\\\\\\\\\\D(y)=(-∞; -2]U[0; 3]U[64; +∞)