解方程3x^2+15x+2*根号(x^2+5x+1)=2根号是在括号外包着的。
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解方程3x^2+15x+2*根号(x^2+5x+1)=2根号是在括号外包着的。
解方程3x^2+15x+2*根号(x^2+5x+1)=2
根号是在括号外包着的。
解方程3x^2+15x+2*根号(x^2+5x+1)=2根号是在括号外包着的。
两边同先同加一个3得3X^2+15X+3+2(X^2+5X+1)=2+3=5
则左边很容易变成了5(X^2+5X+1)=5
看一下就知道X^2+5X=0了
看一下又知道x=0或x=-5了
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