Question

rezolvați în R inecuația
ex. 7​

Answer 1

Răspuns:

a) 5x-2>13 mai mare sau egal

5x>13+2

5x>15

x>15:5

x>3=> xe{3,4, 5, 6, +infinit}

b) 8-4x>-32

-4x>-32-8

-4x>-40/×(-1)

4x>40

x>40:4

x>10=>xe{11, 12, 13,+infinit}

Answer 2

$\it a)\ \ 5x-2\geq13|_{+2} \Rightarrow 5x\geq5|_{:5} \Rightarrow x\geq3 \Rightarrow x\in[3,\ \ \infty)\\ \\ b)\ \ 8-4x>-32 \Rightarrow 8+32>4x \Rightarrow 4x<40|_{:4} \Rightarrow x<10 \Rightarrow x\in(-\infty,\ \ 10)$