问题
解答题
化简或计算 (1)
(2)
|
答案
(1)原式=
-m2 m-2 4 m-2
=m2-4 m-2
=(m+2)(m-2) m-2
=m+2;
(2)原式=
÷x-3 2(x-2) 5-(x+2)(x-2) x-2
=
÷x-3 2(x-2) -(x2-9) x-2
=-
•x-3 2(x-2) x-2 (x+3)(x-3)
=-
.1 2x+6
化简或计算 (1)
(2)
|
(1)原式=
-m2 m-2 4 m-2
=m2-4 m-2
=(m+2)(m-2) m-2
=m+2;
(2)原式=
÷x-3 2(x-2) 5-(x+2)(x-2) x-2
=
÷x-3 2(x-2) -(x2-9) x-2
=-
•x-3 2(x-2) x-2 (x+3)(x-3)
=-
.1 2x+6