已知实数x²+y²=1,(1)求x+y的范围(2)求(y+2)/(x+1)的范围(3)求(x+2)²+(y-3)²的范围
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已知实数x²+y²=1,(1)求x+y的范围(2)求(y+2)/(x+1)的范围(3)求(x+2)²+(y-3)²的范围
已知实数x²+y²=1,(1)求x+y的范围(2)求(y+2)/(x+1)的范围(3)求(x+2)²+(y-3)²的范围
已知实数x²+y²=1,(1)求x+y的范围(2)求(y+2)/(x+1)的范围(3)求(x+2)²+(y-3)²的范围
x^2+y^2=1,是单位圆,|x|=|y|=1,
1),-1≤x+y≤1,
2),1≤﹙y+2﹚/﹙x+1﹚=1+1/﹙x+1﹚≤3,x≠-1.y=0,x=1时代入原式=1.
3),﹙x+2﹚²+﹙y-3﹚²是(x^2+y^2=1)平移至(-2,3),的圆,.