解方程t^2-5t+6=0.25

问题描述:

解方程t^2-5t+6=0.25

t²-5t+6=0.25t²-5t+(6-1/4)=0t²-5t+23/4=0t²-5t+(5/2)²-(5/2)²+23/4=0[t-(5/2)]²-(25-23)/4=0[t-(5/2)]²=1/2|t-(5/2)|=√2/2t-(5/2)=√2/2或 t-(5/2)=-...