要使(AX²-3X)(X²-2X+1)的之中不含X³项,则A=
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要使(AX²-3X)(X²-2X+1)的之中不含X³项,则A=
要使(AX²-3X)(X²-2X+1)的之中不含X³项,则A=
要使(AX²-3X)(X²-2X+1)的之中不含X³项,则A=
答:展开后 ,含有X³项为A*(-2)和-3 (必为AX²与-2X相乘;-3X与X²相乘)
要使展开式不含X³项,则-2A-3=0 即A=-1.5