设f(x)={①x+2,x≤-1,②x²,-1求问应如何代值计算
人气:319 ℃ 时间:2020-03-24 06:25:25
解答
设f(x)={①x+2,x≤-1,
②x²,-1③2x,x≥2
若f(x)=3
∵x²=3
x=±√3
-1<√3<2
∴x=√3符合②f(x)=x² (-1f(√3)=(√3)² =3
则x=√3
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