<div><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">一、一元一次方程式</span></span></div> <div><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">二、一元二次方程式</span></span></div> <div><img alt="一元一次_一元二次_一元多次.jpg" src="https://pimg.1px.tw/pixnet410211/1604733872-1414412612-g.jpg" title="一元一次_一元二次_一元多次.jpg"></div> <div><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">三、一元多次方程式</span></span></div> <div><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">*勘跟定理:</span></span></div> <div><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">設 f(x) = 0 為一實係數多項式方程式,</span></span></div> <div><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">若有兩實數 a、b,</span></span><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">使得f(a)*f(b) < 0,</span></span></div> <div><span style="font-family:comic sans ms,cursive"><span style="font-size:22px">則方程式 f(x) = 0 在 a, b 之間至少存在一個實數根。</span></span></div> <div> </div>