来自龙勤的问题
解一元二次方程X2=4X-45X2+2X=3X2+52X(X-2)=-3
解一元二次方程X2=4X-45X2+2X=3X2+52X(X-2)=-3
1回答
2020-05-1410:10
解一元二次方程X2=4X-45X2+2X=3X2+52X(X-2)=-3
解一元二次方程X2=4X-45X2+2X=3X2+52X(X-2)=-3
X2=4X-4
x^2-4x+4=0
(x-2)^2=0
x=2
5X2+2X=3X2+5
2x^2+2x-5=0
2(x+1/2)^2=11/2
x+1/2=±√11/4
x=(-1±√11)/2
2X(X-2)=-3
2x^2-4x+3=0
2(x^2-2x+1)+1=0
2(x-1)^2+1=0
无解