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(1)y=kx(k為常數,且k≠0),我們就說y是x的正比例函數正比例函數是特殊的一次函數[一次函數的一般形式為y=kx+b(b不為0,k為常數)]圖像作法:1.清單(待定係數)2.描點3.連線正比例函數的圖像是一條直線,一定經過座標的原點當k>0時,圖像經過一,三象限,y隨x的增大而增大當k0時,圖像在一,三象限,在每個象限內,y隨x的增大而减小當k
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