1.x²-x-1 2.3x²y²-2xy-4 3.-4x²+4xy+11y²
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1.x²-x-1 2.3x²y²-2xy-4 3.-4x²+4xy+11y²
1.x²-x-1 2.3x²y²-2xy-4 3.-4x²+4xy+11y²
1.x²-x-1 2.3x²y²-2xy-4 3.-4x²+4xy+11y²
俊狼猎英团队为您解答
都是在实数范围内分解因式:
配方法是最简单快捷的方法,
也可以用求根公式法.
1.x²-x-1
=(X-1/2)^2-5/4
=(X-1/2+√5/2)(X-1/2-√5/2)
2.3x²y²-2xy-4
=3[(XY)^2-2/3(XY)-4/3]
=3[( XY-1/3)^2-13/9]
=3(XY-1/3+√13/3)(XY-1/3-√13/3)
3.-4x²+4xy+11y²
=-4(X^2-XY+1/4Y^2-45/4)
=-4(X-1/2Y+3√5Y/2)(X-1/2-1/2Y-3√5Y/2)