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一般地,兩個變數x,y之間的關係式可以表示成形如y=kx(k為常數,且k≠0)的函數,那麼y就叫做x的正比例函數.正比例函數屬於一次函數,是一次函數的特殊形式,即一次函數y=kx+b中,若b=0,即所謂“y軸上的截距”為零,則為…
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