若多项式a²+2kab与b²-2ab的和不含ab项,则k=要保证正确度!
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若多项式a²+2kab与b²-2ab的和不含ab项,则k=要保证正确度!
若多项式a²+2kab与b²-2ab的和不含ab项,则k=
要保证正确度!
若多项式a²+2kab与b²-2ab的和不含ab项,则k=要保证正确度!
a²+2kab + b²-2ab
=a²+(2k-2)ab+b²
上式中不含ab项,则ab项的系数为0,即有2k-2=0
解得 k=1