(1) 3(x+1/3)^2=4-1/3 解得：x=(根号33)/3±1/3
(2) (x-1)(x+9)=0 解得： x=1或-9
(3) (x-1)(x+5)=0 解得：x=1或-5
(4) (x-4)^2=7 解得： x=4±根号7
(1)3(x+1/3)^2=4-1/3 x=33^(1/2)/3±1/3
(2)(x-1)(x+9)=0 x=1或者-9
(3)(x-1)(x+5)=0 x=1或者-5
(4)(x-4)^2=7 x=4±根号7
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