问题
解答题
解方程:
(1)x2=49
(2)x-2=x(x-2)
答案
(1)x2=49
开方得:x=±7
即x1=-7,x2=7;
(2)x-2=x(x-2)
移项得:x(x-2)-(x-2)=0,
(x-2)(x-1)=0,
x-2=0,x-1=0,
x1=2,x2=1.
解方程:
(1)x2=49
(2)x-2=x(x-2)
(1)x2=49
开方得:x=±7
即x1=-7,x2=7;
(2)x-2=x(x-2)
移项得:x(x-2)-(x-2)=0,
(x-2)(x-1)=0,
x-2=0,x-1=0,
x1=2,x2=1.