[中學] 方程式
請問下面幾個觀念:
1.為什麼 f(x)*g(x) < 0 的解同義於 f(x)/g(x) < 0 且g(x)不等於0
那f(x)*g(x) < 1 的解會同義於 f(x)/g(x) < 1 且g(x)不等於0嗎?
如果有一個題目是 2x^2 + 2mx + m
---------------- <1
4x^2 + 6x + 3
我可以直接變成(2x^2 + 2mx + m)*(4x^2 + 6x + 3) < 1 這樣去算嗎?
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