1)x²+16x=0
x(x+16)=0
x=0或x=-16
(2)5x平方-10x=-5
x方-2x+1=0
(x-1)方=0
x1=x2=1
(3)x(x-3)+x-3=0
(x-3)(x+1)=0
x1=3,x2=-1
(4)2(x-3)²=9-x²
2(x-3)方+(x+3)(x-3)=0
(x-3)[2(x-3)+x+3]=0
(x-3)(3x-3)=0
(x-3)(x-1)=0
x1=3或x2=1
1)x²+16x=0
x(x+16)=0
x=0或x=-16
(2)5x平方-10x=-5
x方-2x+1=0
(x-1)方=0
x1=x2=1
(3)x(x-3)+x-3=0
(x-3)(x+1)=0
x1=3,x2=-1
(4)2(x-3)²=9-x²
2(x-3)方+(x+3)(x-3)=0
(x-3)[2(x-3)+x+3]=0
(x-3)(3x-3)=0
(x-3)(x-1)=0
x1=3或x2=1