若(x²+ax+8)(x²-3x+b)的乘积中不含x²和x³项,则a=,
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若(x²+ax+8)(x²-3x+b)的乘积中不含x²和x³项,则a=,
若(x²+ax+8)(x²-3x+b)的乘积中不含x²和x³项,则a=,
若(x²+ax+8)(x²-3x+b)的乘积中不含x²和x³项,则a=,