Question

已知A=4x的2次方-4XY+Y的2次方/B=X的2次方+XY-5Y的2次方求3A+B

Answer 1

3A+B=3(4x²-4xy+y²)+(x²+xy-5y²)
=12x²-12xy+3y²+x²+xy-5y²
=13x²-11xy-2y²

Answer 2

3A+B=3(4x²-4xy+y²)+(x²+xy-5y²)
=12x²-12xy+3y²+x²+xy-5y²
=13x²-11xy-2y²
=（x-y）（13x+2y)