来自李三广的问题
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
1回答
2020-06-20 22:46
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