解方程X²-2X-2=0和9(X+1/3)=4
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 23:36:38
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解方程X²-2X-2=0和9(X+1/3)=4
解方程X²-2X-2=0和9(X+1/3)=4
解方程X²-2X-2=0和9(X+1/3)=4
X²-2X-2=0
可化为:X²-2X+1-3=0
(X-1)²-3=0
(X-1)²=3
X-1 =根号3 或者X-1 = 负根号3
解得:x =根号3 +1
或者x =负根号3 +1
9(X+1/3)= 4
X+1/3 = 4 / 9
X = 4/9 - 1/3
X =1/9