解方程根号（9-x^2）+根号(4-x^2)=4

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如果(9-x^2)^0.5-(4-x^2)^0.5≠0的话方程两边同乘(9-x^2)^0.5-(4-x^2)^0.5先证明(9-x^2)^0.5-(4-x^2)^0.5≠09≠49-x^2≠4-x^2(9-x^2)^0.5≠(4-x^2)^0.5(9-x^2)^0.5-(4-x^2)^0.5≠0方程两边同乘(9-x^2)^0.5-(4-x^2)^0...