1. 1) (3a-4b)^2
2) (6+2x)^2
3) (7a+2b)^2
4) (y-9x)^2
5) (2n-m)^2
6) (10a+b)
2. 1) (a-1)^2
(101-1)^2= 10000
(-9-1)^2 =100
(31-1)^2 = 900
(0.4-1)^2= 0,36
2) (x+2)^2
(98+2)^2= 10000
(-32+2)^2= 900
(-2.5+2)^2= 0.25
3. 1) (a-1)^2
2) (y+2x)^2
3) (7a+2b)^2
4) (10m+0.5n)^2
5) (0.5a-2b)^2
4х^2-(2х-1)^2=15
4х^2-4х^2+4х-1=15
4х=16
х=16/4
х=4
ответ 4
(6x - 5(x-1))/x.(x-1) = 1/2
(x+5)/x.(x-1) = 1/2
2.(x+5) = x.(x+1)
2x+10=xkv +x
xkv -x -10=0
2x^2 + 3x - 3 = 3x + (-2 + x^2)
2x2 + 3x - 3 - 3x + 2 - x^2 = 0
x^2 - 1 = 0
x^2 = 1
x = +/- 1