-6x^5-6x^4 a-6x³不含x^4项,则a=
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-6x^5-6x^4a-6x³不含x^4项,则a=-6x^5-6x^4a-6x³不含x^4项,则a=-6x^5-6x^4a-6x³不含x^4项,则a=-6x^5-6x^4
-6x^5-6x^4 a-6x³不含x^4项,则a=
-6x^5-6x^4 a-6x³不含x^4项,则a=
-6x^5-6x^4 a-6x³不含x^4项,则a=
-6x^5-6x^4 a-6x³不含x^4项,则a=0