x²-(8-x)²=16 怎麼解?
x²-(8-x)²=16 怎麼解?
x²-(8-x)²=16
x^2-(64-16x+x^2)=16
x^2-64+16x-x^2=16
16x=16+64
16x=80
x=5
x²=(8-x)²+36 这个怎麼解
解:x²=(8-x)²+36
x²-(8-x)²=36
[x+(8-x)][x-(8-x)]=36
(x+8-x)(x-8+x)=36
8(2x-8)=36
16x-64=36
16x=36+64
16x=100
x=25/4
4²+(8-x)²=x²
16=x²-(x-8)²
=(x-x+8)(x+x-8)
=16(x-4)
x-4=1
x=5
6² X²=(8-X)²
解:36x^2=64-16x+x^2
35x^2+16x-64=0
(5x+8)(7x-8)=0
5x+8=0
7x-8=0
x1=-8/5
x2=8/7
6²+x²=(8-x)²
6²+x²=(8-x)²
x²+36=x²-16x+64
16x=64-36
16x=28
x=7/4
x²=6²+(8-x)²
x²=6²+(8-x)²
x²=36+64-16x+x²
16x=100
x=25/4
x²+(8-x) ²=34 要怎麼解? 要过程!
解答如下:
x²+(8-x) ²=34
x² + x² - 16x + 64 = 34
2x² - 16x + 30 = 0
x² - 8x + 15 = 0
(x - 3)(x - 5)= 0
所以x = 3或者x = 5
解方程x²+4²=(8-x)²
解:x²+4²=﹙8-x﹚²
x²+16=64-16x+x²
16x=64-16
16x=48
x=3
x²=(8-x)²-4² 算一下
x²=(8-x)²-4²
解:x²=64-16x+x²-16
16x=48
x=3