Y=3-0,5x
x -2 2
y 4 2
x=0 y=3-0,5*0=3-0=3 (0;3)
y=0 3-0,5x=0⇒0,5x=3⇒x=3:0,5=6 (6;0)
I2х-1I>3
2х-1>3 2х>4 х>2
2х-1<-3 2х<-2 х<-1 2<x<-1
I4x+5I<5
4x+5<5 4x<0 x<0
4x+5>-5 4x>-10 x>-2.5 -2.5<x<0
(2х+1 - (х+1))(2х+1 + (х+1))>0
(2х+1-х-1)(2х+1+х+1)>0
2х(3х+2)>0
х>0 x>-2/3
14 1/4 - 2 3/4= 13 5/4 - 2 3/4= 11 2/4=11 1/2
А) х = (35 × 6)/7
х = 210/7
х = 30
б) х = (11 × 49)/21
х = 539/21
х = 49
1) 5/6-4/10=25/30-12/30=13/30
2) 2 3/5-2 1/5=2/5
3) 13/30:1/5=13*5/30=78
4) 3³=27
5) 78+27=105