(ax+b)(2x²-x+2)
=2ax³-ax²+2ax+2bx²-bx+2b
=2ax³+(-a+2b)x²+(2a-b)x+2b
不含x的一次項(xiàng),且常數(shù)項(xiàng)為-4,
則2a-b=0,2b=-4
則a=-1,b=-2
已知二項(xiàng)式ax+b與多項(xiàng)式2x²-x+2的乘積中不含x的一次項(xiàng),且常數(shù)項(xiàng)為-4,則a=_______,b=_______.
已知二項(xiàng)式ax+b與多項(xiàng)式2x²-x+2的乘積中不含x的一次項(xiàng),且常數(shù)項(xiàng)為-4,則a=_______,b=_______.
數(shù)學(xué)人氣：935 ℃時(shí)間：2020-03-29 23:18:32
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