若(x+3)(x+m)=x^2+kx-15,则k+m的值为(?) A.-3 B.5 C.-2 D.2

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若(x+3)(x+m)=x^2+kx-15,则k+m的值为(?)A.-3B.5C.-2D.2若(x+3)(x+m)=x^2+kx-15,则k+m的值为(?)A.-3B.5C.-2D.2若(x+3)(x

若(x+3)(x+m)=x^2+kx-15,则k+m的值为(?) A.-3 B.5 C.-2 D.2
若(x+3)(x+m)=x^2+kx-15,则k+m的值为(?) A.-3 B.5 C.-2 D.2

若(x+3)(x+m)=x^2+kx-15,则k+m的值为(?) A.-3 B.5 C.-2 D.2
(x+3)(x+m)=x^2+kx-15
x^2+(m+3)x+3m=x^2+kx-15
对应相等
m+3=k
3m=-15
解得
m=-5
k=-2
m+k=-7
哪个都选不了.