А1.
1) x - 5x = x(x+2)-5x = x² +2x-5x = x² -3x =x(x-3)
x+2 x+2 x+2 x+2 x+2
2) x(x-3) : x-3 = x(x-3) * x+2 = x
x+2 x+2 x+2 x-3
Ответ: 2)
А2.
1) 3a² * b = a
b² 6a 2b
2) a+8b - a = a+8b-a = 8b =4
2b 2b 2b 2b
Ответ: 2)
А3.
a = 3 = 3 = 3*18 = 54 =4 ¹⁰/₁₁
1 + 1 + 1 6+3+2 11 11
3 6 9 18
Ответ: 1)
А4.
1) x - 1 = x² -y² = (x-y)(x+y)
y² x xy² xy²
2) 1 - 1 = x-y
y x xy
3) (x-y)(x+y) : x-y = (x-y)(x+y) * xy = x+y
xy² xy xy² x-y y
Ответ: 3)
В1.
1) 1 - 1 - 1 =
(a-x)(x-1) (a-x)(a-1) (a-1)(x-1)
= a-1-(x-1)-(a-x) = a-1-x+1-a+x = 0 = 0
(a-x)(x-1)(a-1) (a-x)(x-1)(a-1) (a-x)(x-1)(a-1)
2) 0 * a³-8x³ = 0
a⁴+b⁴
Ответ: 0.
В2.
y= 2m - x
3c
2m = y+x
3c
2m =3c(y+x)
m = 3c(x+y)
2
m= 1.5c(x+y)
Ответ: 1,5c(x+y)