(1)36x^2-1=0; (2)4x^2=81; (3)(x+5)^2=25; (4)x^2+2x+1=4.

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(1)36x^2-1=0; (2)4x^2=81; (3)(x+5)^2=25; (4)x^2+2x+1=4.
(1)36x^2-1=0; (2)4x^2=81; (3)(x+5)^2=25; (4)x^2+2x+1=4.

(1)36x^2-1=0; (2)4x^2=81; (3)(x+5)^2=25; (4)x^2+2x+1=4.
(1)36x^2-1=0;
x^2=1/36
x=±1/6
(2)4x^2=81;
x^2=81/4
x=±9/2
(3)(x+5)^2=25
x+5=±5
x1=-10,x2=0
(4)x^2+2x+1=4.
(x+1)^2=4
x+1=±2
x1=-3,x2=1

1、x=1/6或-1/6
2、x=9/2或-9/2
3、x=0或-10
4、x=1或-3

(1)36x^2=1;x^2=1/36 x=1/6
(2)4x^2=81 x^2=81/4 x=9/2
(3)(x+5)^2=25 x+5=5 x=0
(4)x^2+2x+1=4 (x+1)^2=4 x+1=2 x=1