Y=1-X2/1+X2的值域怎么求?
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Y=1-X2/1+X2的值域怎么求?
Y=1-X2/1+X2的值域怎么求?
Y=1-X2/1+X2的值域怎么求?
1-X2/1+X2→2-(X2+1)/1+X2→-1 + 2/(1+X2)
∵X2≥0 X2+1≥1
0≤2/1+X2≤2
∴-1≤-1+ 2/1+X2≤1
即Y∈〔-1,1〕