Question

急！！！求未知X值

如图，请问X值是多少

Answer 1

(x-0.65)^2+1.3^2=x^2
x^2-1.3x+0.65^2+1.3^2=x^2
1.3x=2.1125
x=1.625

Answer 2

(X-0.65)^2+1.3^2=x^2
X^2+169/400 -13/10X +169/100=X^2
169/80 -13/10X=0
X=13/8

Answer 3

（x-0.65）²-x²=-1.69
（x-0.65+x）（x-0.65-x）=1.69
-1.3x=0.4225=-1.69
x=1.625

Answer 4

方法一：（x-0.65)²+1.3²=x²
x²-1.3x+0.4225+1.69=x²
－1.3x+2.1125=0
1.3x=2.1125
x=1.625
方法二： （x-0.65)²+1.3²=x²
（x-0.65)²-x²=－1.3²
(x-0.65+x)(x-0.65-x）=－1.69
(2x-0.65)×(-0.65)= －1.69
2x-0.65=2.6
2x=3.25
x=1.625

Answer 5

(x-0.65)^2+1.3^2=x^2
x^2-1.3x+0.65^2+1.3^2=x^2
1.3X=0.65^2+1.3^2
X=(0.65^2+1.3^2)/1.3
X=0.5*0.65+1.3
X=1.625
这样算比较简便

Answer 6

解：由原式得：
X²-2*0.65*X+0.65²+1.3²=X²
0.65²+1.3²=2*0.65*X
X=1.625
答：X的解为1.625 。