计算:(1)(a²-2a)÷(ab-2b)(2) (x²-9)÷(x²-6x+9)
问题描述:
计算:(1)(a²-2a)÷(ab-2b)(2) (x²-9)÷(x²-6x+9)
答
(1)(a²-2a)÷(ab-2b)
=[a(a-2)】÷【b(a-2)]
=a/b
(2) (x²-9)÷(x²-6x+9)
=[(x+3)(x-3)]÷【(x-3)²】
=(x+3)/(x-3)