1
а) (6x²-2x)+(5+10x-5x²)=6x²-2x+5+10x-5x²=x²+8x+5.
б) (6xy+8y)-(2xy+8y-1)=6xy+8y-2xy-8y+1=4xy+1.
в) 2x(3x²+5xy-y²)=6x³+10x²y-2xy².
г) (a-1)(6-a)=6a-a²-6+a=7a-a²-6.
2
a) 24-2(5x+4)=6 5x-9+5x-7=1444
24-10x-8=6 10x=1444+9+7
-10x=6-24+8 10x=1460
-10x=-10 x=146
x=1
3
a)2ab-5b=b(2a-5).
б)3a²-6a³+18a⁴=3a²(1-2a+6a²).
4
ab-4b+ac-4c=a(b+c)-4(b+c)=(b+c)(a-4).