1a)
b(5-6a) _ 3a(1-2b) =5b-6ab-(3a-6ab) = 5b-6ab-3a+6ab = 5b-3a
3ab 3ab 3ab 3ab 3ab
б)
12x² . x-2 = 4x·3x . x-2 = 3x = 3x = 0,3x
5x-10 8x 5(x-2) 4x·2 5·2 10
в)
(a-b)÷ ((a²-b²)/3a²)=(a-b)×(3a²/(a-b)(a+b))=3a²/(a+b)
2.
=-14/(3-n)+(3n+5)/(3-n)=(-14+3n+5)/(3-n)=-(9-3n)/(3-n)=-3
3.
1)
x÷(x-y)+2xy÷(x-y)²=(x²-xy+2xy)÷(x-y)=x(x+y)÷(x-y)
2)
(2x-x-y)÷(x+y)=(x-y)÷(x+y)
3)
(x(x+y)÷(x-y))×((x-y)÷(x+y))=x=-2
4.
4x²+16x+16-2x²+8-x²+4x-4=x²
20x+20=0
x+1=0
x=-1