Question

помогите пожалуйста с номером 1028 и 1029 пожалуйста срочно нужно ​

Answer 1

Ответ:

Пошаговое объяснение:

1028)

$\left \{ {{2x-12>0} \atop {3x-9\leq 0}} \right. \\\\\\\left \{ {{2x>12} \atop {3x\leq 9}} \right. \\\\\left \{ {{x>6} \atop {x\leq 3}} \right.$

x ∈ (-∞;3]∪(6;+∞)

2)

$\left \{ {{5x-25<0} \atop {4x+16>0}} \right. \\\\\left \{ {{5x<25} \atop {4x>-16}} \right. \\\\\left \{ {{x<5} \atop {x>-4}} \right.$

x∈(-4;5)

3)

$\left \{ {{1.1x+1.1\leq 0} \atop {8x-16<0}} \right. \\\\\left \{ {{{1.1x\leq -1.1} \atop {8x<16}} \right. \\\\\left \{ {{x\leq -1} \atop {x<2}} \right.$

x∈(-∞;-1]

1029

1)

$\left \{ {{7x-21\leq 0} \atop {1-x>0}} \right.\\\\\left \{ {{7x\leq 21} \atop {-x>-1}} \right.\\\\\left \{ {{x\leq 3} \atop {x<1}} \right.$

x∈(∞;1)

2)

$\left \{ {{25-5x\geq 0} \atop {3x-18<0}} \right. \\\\\left \{ {{-5x\geq -25} \atop {3x<18}} \right.\\\\\left \{ {{x<5} \atop {x<6}} \right.$

x∈(∞;5)

3)

$\left \{ {{1.2-0.6x>0} \atop {9x+27\leq 0}} \right. \\\\\left \{ {{-0.6x>-1.2} \atop {9x\leq -27}} \right.\\\\\left \{ {{x<2} \atop {x\leq -3}} \right.$

x∈(∞;-3]