问题
解答题
化简下列各式: (1)
(2)
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答案
(1)原式=
•(a+2)(a-2) (a+3)(a-3)
=a-3 2(a+2)
;a-2 2(a+3)
(2)原式=
÷4-x x-2
=(x+2)(x-2)-12 x-2
÷4-x x-2
=x2-4-12 x-2
÷4-x x-2
=(x+4)(x-4) x-2
•4-x x-2
=-x-2 (x+4)(x-4)
.1 x+4