2个数学ti.(b^2)/(4a^2)-(c)/(a)=1-(1)/(x+1)=

问题描述:

2个数学ti.
(b^2)/(4a^2)-(c)/(a)=
1-(1)/(x+1)=

b²/4a²-c/a=b²/4a²-4ac/4a²=(b²-4ac)/4a²
1-1/(x+1)=(x+1-1)/(x+1)=x/(x+1)