问题
解答题
用配方法解方程:-x2+4x-3=0.
答案
-x2+4x-3=0,
-x2+4x=3,
x2-4x=-3,
x2-4x+4=-3+4,
(x-2)2=1,
x-2=±1,
x-2=1或x-2=-1,
x1=3或x2=1.
用配方法解方程:-x2+4x-3=0.
-x2+4x-3=0,
-x2+4x=3,
x2-4x=-3,
x2-4x+4=-3+4,
(x-2)2=1,
x-2=±1,
x-2=1或x-2=-1,
x1=3或x2=1.