问题 解答题
计算:
x2-3x+2
x2-5x+6
÷
x2-5x+4
x2-7x+12
答案

x2-3x+2
x2-5x+6
÷
x2-5x+4
x2-7x+12

=

(x-1)(x-2)
(x-2)(x-3)
÷
(x-1)(x-4)
(x-3)(x-4)
(3分)

=

x-1
x-3
×
x-3
x-1
(4分)

=1.(5分)

单项选择题
单项选择题