3s-2t=1 2s+3t=-7求解
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/17 17:08:04
![3s-2t=1 2s+3t=-7求解](/uploads/image/z/1550578-58-8.jpg?t=3s-2t%3D1+2s%2B3t%3D-7%E6%B1%82%E8%A7%A3)
xn0_e4R(5%s@4 u^M.B,B\J$
xѢTlo&c-zTnx
/Hxm'Z{Uqސ^?J jI4I'z(865p3GKp {2E̷mF>c+})p0cK %!q9dppx)1(L,Ԟ`RHR,湀N]Ƙ>:vޔwTw8-.?/wGu}y}}-s۔-[էՓí:U8z5ͨ6_VyBB&{ @=х+AVoCM`вrpF=
ܮM_)葅OoZ:
3s-2t=1 2s+3t=-7求解
3s-2t=1 2s+3t=-7求解
3s-2t=1 2s+3t=-7求解
用换元法
3s=2t+1
学历低,这个是不是二元一次方程?
你算
3s-2t=1 (1)
2s+3t=-7 (2)
(1)*2-(2)*3
-13t=23
t=-23/13
s=-11/13
两式相减
{3s-2t=1 1)
{2s+3t=-7 2)
1)式x3+2)式x2:
9s+4s=3-14
s=-11/13
2)式x3-1)式x2:
9t+4t=-21-2
t=-23/13