用代入消元法解下列方程组 (1)大括号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=2m+2n=12
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![用代入消元法解下列方程组 (1)大括号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=2m+2n=12](/uploads/image/z/1138387-67-7.jpg?t=%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%881%EF%BC%89%E5%A4%A7%E6%8B%AC%E5%8F%B7x-3y%3D2+y%3Dx+%EF%BC%882%EF%BC%89x%2By%3D5+2x%2By%3D8+%283%294x%2B3y%3D5+x-2y%3D4%284%29m-2%E5%88%86%E4%B9%8Bn%3D2m%2B2n%3D12)
用代入消元法解下列方程组 (1)大括号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=2m+2n=12
用代入消元法解下列方程组 (1)大括号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
m+2n=12
用代入消元法解下列方程组 (1)大括号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=2m+2n=12
x-3y=2
y=x
y-3y=2
y=-1=x
2 x+y=5 2x+y=8
x=5-y 2(5-y)+y=8
10-2y+y=8
y=2 x=5-y=3
3 4x+3y=5 x-2y=4
x=2y+4 4(2y+4)+3y=5
11y=-11 y=-1 x=2y+4=2
4 m-n/2=2 m+2n=12
m=n/2+2 n/2+2+2n=12
5n/2=10 n=4 m=n/2+2=4
1、x=y=-1
2、x=3,y=2
3、x=2,y=-1
4、m=n=4
x-3y=2
y=x
y-3y=2
y=-1=x
2 x+y=5 2x+y=8
x=5-y 2(5-y)+y=8
10-2y+y=8
y=2 x=5-y=3
3 4x+3y=5 x-2y=4
x=2y+4 4(2y+4)+3y=5
11y=-11 y=-1 x=2y+4=2
4、m=n=4