t=lx+2l -lxl
t^2=(x+2)^2+x^2-2lx^2+2xl =2x^2+4x-2lx^2+2xl+4
n=x^2+2x
m=(t+2)(t-2)=t^2-4=2n-2lnl
n≥-1
n≥0時(shí)
m=2n-2n=0
當(dāng)n<0時(shí)
m=4n
-4≤m≤0
M =(lx+2l -lxl +2)(lx+2l -lxl -2)的取值范圍
M =(lx+2l -lxl +2)(lx+2l -lxl -2)的取值范圍
數(shù)學(xué)人氣:945 ℃時(shí)間:2020-03-26 20:53:38
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