(1) x^2-2ax-a^2(2) 3x^2-4xy-2y^2
问题描述:
(1) x^2-2ax-a^2
(2) 3x^2-4xy-2y^2
答
(1) x²-2ax-a²=x²-2ax+a²-2a²=(x-a)²-2a²=(x-a+√2a)(x-a-√2a)(2) 3x²-4xy-2y²=3 [ x²-2*2/3xy+(2/3y)²-10/9 y²]=3 [ ( x-2/3 y)²-10/9 y...