Прошу, решите образцы на обилье R:1) x(x+2)-(x-3)(x+3) = 132) 4x(x-1)-(2x+5)(2x-5) =

1) = x+2x-(x-9)=13
x+2x-x+9=13
2x+9=13
2x=13-9
2x=4 :2
x=2
2) = 4x-4x-(4x-25)=1
4x-4x-4x+25=1
-4x+25=1
-4x=1-25
-4x=-24 : -4
x=6
3) = x+4x-3x-12-6x+4=x-8x+16
4x-3x-12-6x+4=-8x+16
-5x+8= -8x+16
-5x+8x=16+8
3x=24 :3
x=8
4) = x+2x-5x-10-12x+9=x-10x+25
2x-5x-10-12x+9=10x+25
-15x-1= -10x+25
-15x+10x=25+1
-5x=26 : -5
x= -26 = -5 1
5 5

1) х+2х-(х-9)=13
х+2х-х+9=13
2х=4
х= 2
2) 4х-4х-4х+25=1
-4х=-24
х=6
3) х+х-12-6х+4=х-8х+16
3х=24
х=8
4) х-3х-10-12х+9=х-10х+25
-2х=26
х= - 13