x+x*2+x/3=200 求x

问题描述:

x+x*2+x/3=200 求x

x²+4x/3=200
x²+4x/3+4/9=200+4/9
(x+2/3)² = 1804/9
(x+2/3)² = (2√451/3)²
x+2/3=2√451/3,或者,x+2/3=-2√451/3
x = (-2±2√451)/3