2.2x²-5xy+2y²+3x-3y+1 3.2x²-7xy+6y²+2x-y-12 4.a²-b²+4a+2b+3
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![2.2x²-5xy+2y²+3x-3y+1 3.2x²-7xy+6y²+2x-y-12 4.a²-b²+4a+2b+3](/uploads/image/z/995365-37-5.jpg?t=2.2x%26%23178%3B-5xy%2B2y%26%23178%3B%2B3x-3y%2B1+3.2x%26%23178%3B-7xy%2B6y%26%23178%3B%2B2x-y-12+4.a%26%23178%3B-b%26%23178%3B%2B4a%2B2b%2B3)
2.2x²-5xy+2y²+3x-3y+1 3.2x²-7xy+6y²+2x-y-12 4.a²-b²+4a+2b+3
2.2x²-5xy+2y²+3x-3y+1 3.2x²-7xy+6y²+2x-y-12 4.a²-b²+4a+2b+3
2.2x²-5xy+2y²+3x-3y+1 3.2x²-7xy+6y²+2x-y-12 4.a²-b²+4a+2b+3
2.2x²-5xy+2y²+3x-3y+1
=(x-2y)(2x-y)+(x-2y)+2x-y+1
=(x-2y)(2x-y+1)+(2x-y+1)
=(x-2y+1)(2x-y+1)
3.2x²-7xy+6y²+2x-y-12
=(x-2y)(2x-3y)-4x+8y+6x-9y-12
=(x-2y)(2x-3y)-4(x-2y)+3(2x-3y)-12
=(x-2y+3)(2x-3y-4)
4.a²-b²+4a+2b+3
=a²+4a+4-b²+2b-1
=(a²+4a+4)-(b²-2b+1)
=(a+2)²-(b-1)²
=(a+2+b-1)(a+2-b+1)
2.(x-2y+1)(2x-y+1)
2.(x-2y+1)(2x-y+1)