求初2数学解二元一次方程组,急1.用代入消元法解下列方程组:(1){y=2x,{x+y=12;(2){x=2分之y-5,{4x+3y=65;(3){x+y+11,{x-y=7;(4){3x-2y=9,{x+2y=3.2.用代入消元法解下列方程组:(1){x-3y=2,{y=x;(2){x+y=5,{2x+y=8;(3){4x=
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 00:15:33
![求初2数学解二元一次方程组,急1.用代入消元法解下列方程组:(1){y=2x,{x+y=12;(2){x=2分之y-5,{4x+3y=65;(3){x+y+11,{x-y=7;(4){3x-2y=9,{x+2y=3.2.用代入消元法解下列方程组:(1){x-3y=2,{y=x;(2){x+y=5,{2x+y=8;(3){4x=](/uploads/image/z/3809909-29-9.jpg?t=%E6%B1%82%E5%88%9D2%E6%95%B0%E5%AD%A6%E8%A7%A3%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%2C%E6%80%A51.%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B6%88%E5%85%83%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%9A%281%29%7By%3D2x%2C%7Bx%2By%3D12%3B%282%29%7Bx%3D2%E5%88%86%E4%B9%8By-5%2C%7B4x%2B3y%3D65%3B%283%29%7Bx%2By%2B11%2C%7Bx-y%3D7%3B%284%29%7B3x-2y%3D9%2C%7Bx%2B2y%3D3.2.%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B6%88%E5%85%83%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B%E7%BB%84%EF%BC%9A%EF%BC%881%EF%BC%89%7Bx-3y%3D2%2C%7By%3Dx%3B%282%29%7Bx%2By%3D5%2C%7B2x%2By%3D8%3B%283%29%7B4x%3D)
求初2数学解二元一次方程组,急1.用代入消元法解下列方程组:(1){y=2x,{x+y=12;(2){x=2分之y-5,{4x+3y=65;(3){x+y+11,{x-y=7;(4){3x-2y=9,{x+2y=3.2.用代入消元法解下列方程组:(1){x-3y=2,{y=x;(2){x+y=5,{2x+y=8;(3){4x=
求初2数学解二元一次方程组,急
1.用代入消元法解下列方程组:
(1){y=2x,
{x+y=12;
(2){x=2分之y-5,
{4x+3y=65;
(3){x+y+11,
{x-y=7;
(4){3x-2y=9,
{x+2y=3.
2.用代入消元法解下列方程组:
(1){x-3y=2,
{y=x;
(2){x+y=5,
{2x+y=8;
(3){4x=3y=5,
{x=2y=4;
(4){m-2分之n=2,
{2m=3n=12.
求初2数学解二元一次方程组,急1.用代入消元法解下列方程组:(1){y=2x,{x+y=12;(2){x=2分之y-5,{4x+3y=65;(3){x+y+11,{x-y=7;(4){3x-2y=9,{x+2y=3.2.用代入消元法解下列方程组:(1){x-3y=2,{y=x;(2){x+y=5,{2x+y=8;(3){4x=
第一大题 1、 x+2x=12 x=4 y=8 2、4*(分之y-5)+3y=65 y=15 x=5
3、x=7+y 7+y+y=11 y=2 x=9 4、x=3-2y 3(3-2y)-2y=9 y=0 x=3
第二大题 1、 x-3x=2 x=-1 y=-1 2、x=5-y 2(5-y)+y=8 y=2 x=3
3、x=4/5 y=3/5 x=4 y=2 4、m=6 n=4
1,X=4 y=8
很简单
既然Y=2X,带进去,X+2X=12,3X=12 所以X=4,将X=4代入,Y=8