1.第一题无解
(x-10)^2+(x-10)+9 =0
(x-10+1/2)^2-1/4+9=0
2.
(2x+1+2）^2 =0
2x=-3
x=-2/3
3.
5x(根号3-x)+(根号3-x) =0
(5x+1)(根号3-x) = 0
x=-1/5或者x=根号3
4.
2（x-3）^2=(x-3)(x+3)
(x-3)(2x-6-x-3)=0
x=3或者x=9