用代入法解下列方程 1){y=3x,16x-y=18 2){y=3x+4,2x+3y=45 3){3x-y=7,5x+2y=84){x-2=2(y-1),2(x-2)+(y-1)=5
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![用代入法解下列方程 1){y=3x,16x-y=18 2){y=3x+4,2x+3y=45 3){3x-y=7,5x+2y=84){x-2=2(y-1),2(x-2)+(y-1)=5](/uploads/image/z/404277-69-7.jpg?t=%E7%94%A8%E4%BB%A3%E5%85%A5%E6%B3%95%E8%A7%A3%E4%B8%8B%E5%88%97%E6%96%B9%E7%A8%8B+1%EF%BC%89%7By%3D3x%2C16x-y%3D18+2%EF%BC%89%7By%3D3x%2B4%2C2x%2B3y%3D45+3%EF%BC%89%7B3x-y%3D7%2C5x%2B2y%3D84%EF%BC%89%7Bx-2%3D2%EF%BC%88y-1%EF%BC%89%2C2%EF%BC%88x-2%EF%BC%89%2B%EF%BC%88y-1%EF%BC%89%3D5)
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用代入法解下列方程 1){y=3x,16x-y=18 2){y=3x+4,2x+3y=45 3){3x-y=7,5x+2y=84){x-2=2(y-1),2(x-2)+(y-1)=5
用代入法解下列方程 1){y=3x,16x-y=18 2){y=3x+4,2x+3y=45 3){3x-y=7,5x+2y=8
4){x-2=2(y-1),2(x-2)+(y-1)=5
用代入法解下列方程 1){y=3x,16x-y=18 2){y=3x+4,2x+3y=45 3){3x-y=7,5x+2y=84){x-2=2(y-1),2(x-2)+(y-1)=5
1){y=3x,16x-y=18
16x-3x=18
x=18/13
y=54/13
2){y=3x+4,2x+3y=45
2x+3(3x+4)=45
2x+9x+12=45
11x=33
x=3
y=13
3){3x-y=7,
y=3x-7
5x+2y=8
5x+2(3x-7)=8
5x+6x-14=8
11x=22
x=2
y=-1
4){x-2=2(y-1),
2(x-2)+(y-1)=5
2*2(y-1)+(y-1)=5
5(y-1)=5
y-1=1
y=2
x=4