1.
(x-6)(4x+7) ≤0 9-x{9-x≠0{(x-6)(4x+7)(9-x)≤0x≠9(x-6)(4x+7)(9-x)≤0-(x-9)(x-6)*4(x+⁷/₄) ≤0(x-9)(x-6)(x+⁷/₄) ≥0x=9 x=6 x=-⁷/₄ - + - +-------- -⁷/₄ ----------- 6 ------------- 9 --------------- \\\\\\\\\\\\\ \\\\\\\\\\\\\\\\x∈[-⁷/₄; 6] U (9; +∞)2.
x²-3x+2 >0 6+3x{6+3x≠0{(x²-3x+2)(6+3x) >06+3x≠03x≠-6x≠-2(x²-3x+2)(6+3x)>0Разложим на множители:x²-3x+2=0D=9-8=1x₁=
3-1=1 2x₂=
3+1=2 2x²-3x+2=(x-1)(x-2)3(x+2)(x-1)(x-2)>0(x+2)(x-1)(x-2)>0x=-2 x=1 x=2 - + - +------------ -2 -------------- 1 ------------ 2 ------------- \\\\\\\\\\\\\\ \\\\\\\\\\\\\\\x∈(-2; 1) U (2; +∞)3.
3x²+4x >0 9-x{9-x≠0{(3x²+4x)(9-x)>09-x≠0x≠9(3x²+4x)(9-x)>0-3x(x+⁴/₃)(x-9)>0x(x+⁴/₃)(x-9)<0x=0 x=-⁴/₃ x=9 - + - + ------ -⁴/₃ --------- 0 ------------- 9 -----------\\\\\\\\\ \\\\\\\\\\\\\\x∈(-∞; -⁴/₃) U (0; 9)4.
8-32x² >0 x-10{x-10≠0{(8-32x²)(x-10)>0x≠10(8-32x²)(x-10)>0-8(4x²-1 )(x-10)>0(2x-1)(2x+1)(x-10)<02(x-0.5)*2(x+0.5)(x-10)<0(x-0.5)(x+0.5)(x-10)<0x=0.5 x=-0.5 x=10 - + - +------- -0.5 --------- 0.5 ---------- 10 --------------\\\\\\\\\ \\\\\\\\\\\\\x∈(-∞; -0,5) U (0.5; 10)