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2) -x+9y-6z
3) 6m²-mn-2n²
4) 9p²-24pq+16q²
5) 2a-3b
3x+5x-5y+6y+z-4z = 8x+y-3z
2)
6x+8y-z-7x+y-5z
= 6x-7x+8y+y-z-5z
= -x+9y-6z
3)
2m.3m+2m.(-2n)+n.3m+n.(-2n)
= 7m²-4mn+3mn-2n²
= 7m²-mn-2n²
4)
(3p-4q)² = (3p)²+2.3p.(-4q)+(-4q)²
= 9p²-24pq+16q²
5)
6a²-7ab-3b² : 3a+b
= (3a+b).(2a-3b) : 3a+b
= 2a-3b
tandai jwbn trbaik y...