1.不等式3x-5/x^2+2x-3≤2的解集是( )A.[-1/2,1] B.[1/2,1)∪(1.3] C.(-∞,-3)∪[-1,1/2]∪(1,+∞)D.[-1/2,1)∪(1,3]2.圆心在Y轴上,半径为1,且过点(1,2)的圆的方程为( )A.x^2+(y-2)^2=1B.x^2+(y+2)^2=1C.(x-1)^2+(y-3
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![1.不等式3x-5/x^2+2x-3≤2的解集是( )A.[-1/2,1] B.[1/2,1)∪(1.3] C.(-∞,-3)∪[-1,1/2]∪(1,+∞)D.[-1/2,1)∪(1,3]2.圆心在Y轴上,半径为1,且过点(1,2)的圆的方程为( )A.x^2+(y-2)^2=1B.x^2+(y+2)^2=1C.(x-1)^2+(y-3](/uploads/image/z/10243421-53-1.jpg?t=1.%E4%B8%8D%E7%AD%89%E5%BC%8F3x-5%2Fx%5E2%2B2x-3%E2%89%A42%E7%9A%84%E8%A7%A3%E9%9B%86%E6%98%AF%EF%BC%88+%EF%BC%89A.%5B-1%2F2%2C1%5D+B.%5B1%2F2%2C1%29%E2%88%AA%281.3%5D+C.%28-%E2%88%9E%2C-3%EF%BC%89%E2%88%AA%5B-1%2C1%2F2%5D%E2%88%AA%EF%BC%881%2C%2B%E2%88%9E%EF%BC%89D.%5B-1%2F2%2C1%29%E2%88%AA%281%2C3%5D2.%E5%9C%86%E5%BF%83%E5%9C%A8Y%E8%BD%B4%E4%B8%8A%2C%E5%8D%8A%E5%BE%84%E4%B8%BA1%2C%E4%B8%94%E8%BF%87%E7%82%B9%EF%BC%881%2C2%EF%BC%89%E7%9A%84%E5%9C%86%E7%9A%84%E6%96%B9%E7%A8%8B%E4%B8%BA%EF%BC%88+%EF%BC%89A.x%5E2%2B%28y-2%29%5E2%3D1B.x%5E2%2B%28y%2B2%29%5E2%3D1C.%28x-1%29%5E2%2B%28y-3)
1.不等式3x-5/x^2+2x-3≤2的解集是( )A.[-1/2,1] B.[1/2,1)∪(1.3] C.(-∞,-3)∪[-1,1/2]∪(1,+∞)D.[-1/2,1)∪(1,3]2.圆心在Y轴上,半径为1,且过点(1,2)的圆的方程为( )A.x^2+(y-2)^2=1B.x^2+(y+2)^2=1C.(x-1)^2+(y-3
1.不等式3x-5/x^2+2x-3≤2的解集是( )
A.[-1/2,1] B.[1/2,1)∪(1.3] C.(-∞,-3)∪[-1,1/2]∪(1,+∞)
D.[-1/2,1)∪(1,3]
2.圆心在Y轴上,半径为1,且过点(1,2)的圆的方程为( )
A.x^2+(y-2)^2=1
B.x^2+(y+2)^2=1
C.(x-1)^2+(y-3)^2=1
D.x^2+(y-3)^2=1
1.不等式3x-5/x^2+2x-3≤2的解集是( )A.[-1/2,1] B.[1/2,1)∪(1.3] C.(-∞,-3)∪[-1,1/2]∪(1,+∞)D.[-1/2,1)∪(1,3]2.圆心在Y轴上,半径为1,且过点(1,2)的圆的方程为( )A.x^2+(y-2)^2=1B.x^2+(y+2)^2=1C.(x-1)^2+(y-3
1.你最好在分母分子上加上括号
2.A
x^2+(y-a)^2=1
将点(1,2)代入 a=2
AA
第一题特殊值法。
第二题设出方程,带入特殊值。
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