(1)
(2t+3)^2=3(2t+3)
(2t+3)^2-3(2t+3)=0
(2t+3)(2t+3-3)=0
t=-3/2或0
(2)
(3-y)^2+y^2=9
9-6y+y^2+y^2=9
2y^2-6y=0
y(y-3)=0
y=0或3
(3)
(x+1)^2=3x+2
x^2+2x+1=3x+2
x^2-x-1=0
X^2-X+1/4-5/4=0
(X-1/2)^2=5/4
X=(±根5+1)/2
(1)
(2t+3)^2=3(2t+3)
(2t+3)^2-3(2t+3)=0
(2t+3)(2t+3-3)=0
t=-3/2或0
(2)
(3-y)^2+y^2=9
9-6y+y^2+y^2=9
2y^2-6y=0
y(y-3)=0
y=0或3
(3)
(x+1)^2=3x+2
x^2+2x+1=3x+2
x^2-x-1=0
X^2-X+1/4-5/4=0
(X-1/2)^2=5/4
X=(±根5+1)/2