Question

Sa se rezolve inecuatiile 21-7x mai mare sau egal decat 0

2.4(x-3)+5 mai mic sau egal decat 3(2x-5)-2

Answer 1

Răspuns:

Explicație pas cu pas:

21-7x>=0

7x<=21

x<=3

x= ( - infinit,3]

4x-12+5<=6x-15-2

4x-7<=6x-17

2x>=10

x>=5

x=[5,+ infinit)

Answer 2

Răspuns:

$21-7x\geq 0\\\\7x\leq 21-0\\\\x\leq 21:7= > x\leq 3= > x=(-\alpha ,3]\\\\\\4(x-3)+5\leq 3(2x-5)-2\\\\4x-12+5\leq 6x-15-2\\\\-12+5+15+2 \leq 6x-4x\\\\2x\geq 10= > x\geq 10:2= > x\geq 5= > x=[5,\alpha )$