题目内容
(1)计算:(
)-1+
-
-(2004-
)0;
(2)分解因式:x3-x2y-x+y.
1 |
10 |
12 |
2 | ||
2-
|
2 |
(2)分解因式:x3-x2y-x+y.
(1)、原式=10+2
-2(2+
)-1=5;
(2)、解法1:
原式=(x3-x2y)-(x-y)(1分)
=x2(x-y)-(x-y)(2分)
=(x-y)(x2-1)(3分)
=(x-y)(x+y)(x-1);(4分)
解法2:
原式=(x3-x)-(x2y-y)(1分)
=x(x2-1)-y(x2-1)(2分)
=(x2-1)(x-y)(3分)
=(x-1)(x+1)(x-y).
3 |
3 |
(2)、解法1:
原式=(x3-x2y)-(x-y)(1分)
=x2(x-y)-(x-y)(2分)
=(x-y)(x2-1)(3分)
=(x-y)(x+y)(x-1);(4分)
解法2:
原式=(x3-x)-(x2y-y)(1分)
=x(x2-1)-y(x2-1)(2分)
=(x2-1)(x-y)(3分)
=(x-1)(x+1)(x-y).
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