-12xy减去x的平方再减去36y的平方,
问题描述:
-12xy减去x的平方再减去36y的平方,
答
X²-12Xy-36Y²=X²-2×6×XY+(6Y)²-72Y²=(X-6Y)²-72Y²=(X-6Y+6√2Y)(X-6Y-6√2Y)
答
-12xy-x^2-36y^2
=-(x^2+12xy+36y^2)
=-(x+6y)^2
答
=-(x²+12xy+36y²)
=-(x+6y)²