若x²+6x+k=(x+h)²,那么k=( ),h=( ).
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若x²+6x+k=(x+h)²,那么k=( ),h=( ).
若x²+6x+k=(x+h)²,那么k=( ),h=( ).
若x²+6x+k=(x+h)²,那么k=( ),h=( ).
分别填:9 3
x²+6x+k
=x²+6x+3²+k-9
=(x+3)²+k-9
于是
h=3
k-9=0得k=9