题型二、解简单的高次方程:
x3 8
x4 16 15x 16 0 2
5x3 118 0
5x3 625 0
15x 81 0 3
x3 27
y3 9y 0
x3 3x2 10x 0
x3 x2 x 1 0
(x2 1)(x 2) 2.
x4 2008x2 2009x 2008 0
题型三、因式分解法解双二次方程
x4 9x2 18 0
x4 5x2 36 0
x4 3x2 28 0
x4 5x2 14 0;
2x4 3x2 1 0;
x4 2x 32x 3
x4 7x2 10 0;
x4-(a2+b2)x2+a2b2=0
题型四、用换元法解下列高次方程:
222(x-x)-4(2x-2x-3)=0
222(x-2x+3)=4x-8x+17
222(x+8x+12)+6x+48x+81=0
x 4x2 4x 12 0
x 2 x 3 x 4 x 5 44
x2 2
四、解答题