如何解 X*X+1.5X*1.5X+2X*2X=300

问题描述:

如何解 X*X+1.5X*1.5X+2X*2X=300

X*X+1.5X*1.5X+2X*2X=300
(1+1.5*1.5+2*2)x^2=300
(1+2.25+4)x^2=300
7.25x^2=300
x^2=41.4
x=-+6.435