1)(√2X+1)^2=0 X=-√2/2
3)X^2-6X=(5-2X)^2-9
(X-3)^2=(5-2X)^2
(A) X-3=5-2X 3X=8 X1=8/3
(B) X-3=2X-5 X2=2
有两个根:X1=8/3 X2=2