解下列二元一次方程·在线等

问题描述:

解下列二元一次方程·在线等
(3x+1)^2=9(2x+3)^2
2x^2+6x-3=0
(x+2)/3-(x^2-3)/2=2
16(x+5)^2-9(x+5)-3=0
soon!

1
(3x+1)^2=9(2x+3)^2
3x+1=3(2x+3)
x=-8/3
或3x+1=-3(2x+3),x=-10/9
所以:x1=-8/3,x2=-10/9
2
2x^2+6x-3=0
x^2+3x-3/2=0
(x+3/2)^2=3/4
x1=(-3+√3)/2,x2=(-3-√3)/2
3
(x+2)/3-(x^2-3)/2=2
2(x+2)-3(x^2-3)=12
3x^2-2x-1=0
(3x+1)(x-1)=0
x1=-1/3,x2=1
4
16(x+5)^2-9(x+5)-3=0
x+5=t
16t^2-9t-3=0
(4t-9/8)^2=273/64
t=(9±√273)/8
x1=(-31+√273)/8
x2=(-31-√273)/8