3^2+(4-x)^2=x^2请高人帮忙计算,尤其平方根的算法.
问题描述:
3^2+(4-x)^2=x^2请高人帮忙计算,尤其平方根的算法.
答
3^2+(4-x)^2=x^2
9+16-2x+x^2=x^2
2x=25
x=12.5
答
3^2+(4-x)^2=x^2
展开:9+16+x^2-8X=x^2
两边消去x^2,移项:9+16=8X
得:X=25/8
答
3 ² + (4 - x)² = x ²
9 + (4 - x)² = x ²
9 = x ² - (4 - x)²
9 = 【x + (4 - x)】【x - (4 - x)】 (平方差公式)
9 = (x + 4 - x)(x - 4 + x)
9 = 4 (2 x - 4)
9 = 8 x - 16
8 x = 9 + 16
8 x = 25
x = 25 / 8
【俊狼猎英】团队为您解答.
答
3^2+(4-x)^2=x^2
9+16-8x+x^2=x^2
8x=25
x=25/8