问题
解答题
计算题: (1)
(2)(x+3)(x-4)-(x-1)2 (3)(x4+2x3-
|
答案
(1)原式=5-(-2)+1=5+2+1
=8;
(2)原式=x2-4x+3x-12-x2+2x-1
=x-13;
(3)原式=(x4+2x3-
x2)÷1 2
x21 4
=4x2+8x-2.
计算题: (1)
(2)(x+3)(x-4)-(x-1)2 (3)(x4+2x3-
|
(1)原式=5-(-2)+1=5+2+1
=8;
(2)原式=x2-4x+3x-12-x2+2x-1
=x-13;
(3)原式=(x4+2x3-
x2)÷1 2
x21 4
=4x2+8x-2.