2个数学ti.
问题描述：
2个数学ti.
(b^2)/(4a^2)-(c)/(a)=
1-(1)/(x+1)=
答
b²/4a²-c/a=b²/4a²-4ac/4a²=(b²-4ac)/4a²
1-1/(x+1)=(x+1-1)/(x+1)=x/(x+1)