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設正比函數為y=kx(k≠0)(x為任何實數,即x∈R)當k>0時,y隨x↑而↑,過1.3象限當k<0時,y隨x↑而↓,過2,4象限設一次函數為y=kx+b(k≠0,b≠0)(x∈R)①當k>0,y隨x↑而↑b>0時,在1,2,3象限.交y軸於正半軸b<0時,…
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