1) 3^(5-x)≤3⁴ 5-x≤4 -x≤4-5 -x≤ -1 x≥12) 4^(x) (1-3*4⁻²) >52 4^(x) (1- ³/₁₆)>52 4^(x) * (¹³/₁₆)>52 4^(x) >
52*16 13 4^(x) > 4*16 4^(x)> 4³ x>33) 5x+6 > x² -x² +5x+6>0 x² -5x-6<0 x² -5x-6=0D=25+24=49x₁=
5-7 = -1 2x₂=
5+7 = 6 2 + - +-------- -1 --------- 6 ------------ \\\\\\\\\\x∈(-1; 6)4) Пусть 0,5^(x)=y и 0.25^(x)=(0.5²)^(x)=(0.5^(x))²=y²y² -12y+32≥0y² -12y+32=0D=144-128=16y₁=
12-4 = 4 2y₂= 8 + - +--------- 4 ---------- 8 --------------\\\\\\\\\\ \\\\\\\\\\\\\\\\{y≤4{y≥81) 0.5^(x)≤4 (1/2)^(x)≤2² 2^(-x)≤2² -x≤2 x≥ -22) 0.5^(x)≥8 (1/2)^(x)≥2³ 2^(-x)≥2³ -x≥3 x≤ -3x∈(-∞; -3]U[-2; +∞)