2)=(10x²+10xy)+(5x+5y)=10x(x+y)+5(x+y)=(x+y)(10x+5)
4)=(48xz²+32xy²)-(15yz²+10y³)=16x(3z²+2y²)-5y(3z²+2y²)=
=(3z²+2y²)(16x-5y)
1) 4х-55=2х+105
4х-2х=105+55
2х=160
х=80
2) 3х-9х+70=20-5х
3х-9х+5х=20-70
-х=-50
х=50
3) 2х+6=4х-20
2х-4х=-20-6
-2х=-26
2х=26
х=13
4) 1/4х=-10
х=-40
5) 4х-7х+35=17
-3х=17-35
-3х=-18
х=6
6) 5х-7х+35=6
-2х=6-35
-2х=-29
х=14.5
(x+2)(x-1)(x-3)^2>0
x+2>0 x-1>0 (x-3)^2>0
x>-2 x>1 x^2-6x+9>0
{x>3 x>3
------ (-2)----------(1)-------(3)-------->
(-2;1), (1;3),(3;+&)
У=х+12
y=kx+b
к=1
b=12
y=7x-8
x=2,5
y(2,5)=7*2,5-8=17,5-8
y(2,5)=9,5
(a-6)²+2a(3-2a)=a²-24a+36+6a-4a²=-3a²-18a+36 вот так