已知k为常数,切关于y的代数式3(ky²-4y)-12(2y²-y-3)的值为定值.快的!①求k的值;②求此代数式的值.
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![已知k为常数,切关于y的代数式3(ky²-4y)-12(2y²-y-3)的值为定值.快的!①求k的值;②求此代数式的值.](/uploads/image/z/3738284-44-4.jpg?t=%E5%B7%B2%E7%9F%A5k%E4%B8%BA%E5%B8%B8%E6%95%B0%2C%E5%88%87%E5%85%B3%E4%BA%8Ey%E7%9A%84%E4%BB%A3%E6%95%B0%E5%BC%8F3%EF%BC%88ky%26%23178%3B-4y%EF%BC%89-12%EF%BC%882y%26%23178%3B-y-3%EF%BC%89%E7%9A%84%E5%80%BC%E4%B8%BA%E5%AE%9A%E5%80%BC.%E5%BF%AB%E7%9A%84%21%E2%91%A0%E6%B1%82k%E7%9A%84%E5%80%BC%EF%BC%9B%E2%91%A1%E6%B1%82%E6%AD%A4%E4%BB%A3%E6%95%B0%E5%BC%8F%E7%9A%84%E5%80%BC.)
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