№1
1) ху+2y+хz+2z
2) mn-4n+mk-4k
3) 4ac-6bc+10a-15b
4) ax-5bx+2x+ay-5by+2y
5) bc-3b+ac-3a
6) ax-bx-ay+by
7) 12a²+18ab-8ac-12bc
8) 2a-2b-4-ac+cb+2c
№2
1) (3a-4)(2a+1)+5a=6a²-8a+3a-4+5a=6a²-4
2) (y+3)(y-4)-y(y-1)=y²+3y-4y-12-y²+y= -12
3) (a+b)(a-3b)+2ab=a²+ab-3ab-3b²+2ab=a²-3b²
4) (2x-5)(2x+3)-4(x²-x)=4x²-10x+6x-15-4x²+4x= -15
№1
1) ху+2y+хz+2z
2) mn-4n+mk-4k
3) 4ac-6bc+10a-15b
4) ax-5bx+2x+ay-5by+2y
5) bc-3b+ac-3a
6) ax-bx-ay+by
7) 12a²+18ab-8ac-12bc
8) 2a-2b-4-ac+cb+2c
№2
1) (3a-4)(2a+1)+5a=6a²-8a+3a-4+5a=6a²-4
2) (y+3)(y-4)-y(y-1)=y²+3y-4y-12-y²+y= -12
3) (a+b)(a-3b)+2ab=a²+ab-3ab-3b²+2ab=a²-3b²
4) (2x-5)(2x+3)-4(x²-x)=4x²-10x+6x-15-4x²+4x= -15