由題意可得:
{ 1+p+q=0 (1)
{ 4+2p+q=-9 (2)
(2)-(1)得:
3+p=-9
解得:p=-12
代入(1)得:1-12+q=0
解得:q=11
所以:p=-12,q=11
在代數(shù)式x^2+px+q,當(dāng)x=1時(shí),它的值是0,當(dāng)x=2時(shí),它的值是-9,則P= Q=
在代數(shù)式x^2+px+q,當(dāng)x=1時(shí),它的值是0,當(dāng)x=2時(shí),它的值是-9,則P= Q=
數(shù)學(xué)人氣:833 ℃時(shí)間:2020-09-07 10:51:35
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