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x1=1m,x2=6m x1=3m,x2=2m x1=﹣3m,x2=2m x1=﹣3m,x2=﹣2m
(﹣2,3) (﹣3,﹣2] [﹣2,2) (﹣3,3]
x2+2x+1=x(x+2)+1 (x2﹣4)x=x3﹣4x ax+bx=(a+b)x m2﹣2mn+n2=(m+n)2
(﹣5,1] [1,3) [﹣7,3) (﹣5,3)
={m|f(m)<0},则( ) A.∀m∈A.,都有f(m+3)>0 ∀m∈A.,都有f(m+3)<0 ∃m0∈A.,使得f(m0+3)=0 ∃m0∈A.,使得f(m0+3)<0
x3m+1=(x3)m+1 x3m+1=x•x3m x3m+1=xm•x2m•x x3m+1=(xm)3•x
(-∞,-1),(3,+∞) (-1,3) (-3,1) (-∞,-3),(1,+∞)
{x│0≤x<1} {x│0≤x<2} {x│0≤x≤1} {x│0≤x≤2}
{x|﹣3<x<2} {x|﹣3<x<1} {x|1<x<2} {x|2<x<3}
x2+2x+1=x(x+2)+1 (x2﹣4)x=x3﹣4x ax+bx=(a+b)x m2﹣2mn+n2=(m+n)2