下面二元一次方程组答案+过程1.x/3+y/4=3/44(x+2)=3(y-4)2.(x+y)/2+(x-y)/2=74(x+y)-5(x-y)=23.(s-1)/5=(t+3)/2s-1/2=(1-t)/24.(2x-7y-8)二次方+|3x-8y-10|=0
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![下面二元一次方程组答案+过程1.x/3+y/4=3/44(x+2)=3(y-4)2.(x+y)/2+(x-y)/2=74(x+y)-5(x-y)=23.(s-1)/5=(t+3)/2s-1/2=(1-t)/24.(2x-7y-8)二次方+|3x-8y-10|=0](/uploads/image/z/1545066-18-6.jpg?t=%E4%B8%8B%E9%9D%A2%E4%BA%8C%E5%85%83%E4%B8%80%E6%AC%A1%E6%96%B9%E7%A8%8B%E7%BB%84%E7%AD%94%E6%A1%88%2B%E8%BF%87%E7%A8%8B1.x%2F3%2By%2F4%3D3%2F44%EF%BC%88x%2B2%EF%BC%89%3D3%28y-4%292.%28x%2By%29%2F2%2B%28x-y%29%2F2%3D74%28x%2By%29-5%28x-y%29%3D23.%28s-1%29%2F5%3D%28t%2B3%29%2F2s-1%2F2%3D%281-t%29%2F24.%282x-7y-8%29%E4%BA%8C%E6%AC%A1%E6%96%B9%2B%7C3x-8y-10%7C%3D0)
下面二元一次方程组答案+过程1.x/3+y/4=3/44(x+2)=3(y-4)2.(x+y)/2+(x-y)/2=74(x+y)-5(x-y)=23.(s-1)/5=(t+3)/2s-1/2=(1-t)/24.(2x-7y-8)二次方+|3x-8y-10|=0
下面二元一次方程组答案+过程
1.x/3+y/4=3/4
4(x+2)=3(y-4)
2.(x+y)/2+(x-y)/2=7
4(x+y)-5(x-y)=2
3.(s-1)/5=(t+3)/2
s-1/2=(1-t)/2
4.(2x-7y-8)二次方+|3x-8y-10|=0
下面二元一次方程组答案+过程1.x/3+y/4=3/44(x+2)=3(y-4)2.(x+y)/2+(x-y)/2=74(x+y)-5(x-y)=23.(s-1)/5=(t+3)/2s-1/2=(1-t)/24.(2x-7y-8)二次方+|3x-8y-10|=0
1.x/3+y/4=3/4 ①
4(x+2)=3(y-4) ②
由②得x=3y/4-3 ③
将③代入①得y=7/2
将y=7/2代入③得x=-3/8
2.(x+y)/2+(x-y)/2=7 ①
4(x+y)-5(x-y)=2 ②
由①得x+y+x-y=14
x=7
将x=7代入②得y=1
3.(s-1)/5=(t+3)/2 ①
s-1/2=(1-t)/2 ②
由②得s=2-t ③
将③代入①得t=-13/7
将t=-13/7代入②得s=27/7
4.(2x-7y-8)二次方+|3x-8y-10|=0
由题意得2x-7y-8=0 ①
3x-8y-10=0 ②
由①得x=(8+7y)/2 ③
将③代入②得y=-4/5
将y=-4/5代入③得x=1/10
.x/3+y/4=3/4 ①
4(x+2)=3(y-4) ②
由②得x=3y/4-3 ③
将③代入①得y=7/2
将y=7/2代入③得x=-3/8
2.(x+y)/2+(x-y)/2=7 ①
4(x+y)-5(x-y)=2 ②
由①得x+y+x-y=14
x=7
将x=7代入②得y=...
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.x/3+y/4=3/4 ①
4(x+2)=3(y-4) ②
由②得x=3y/4-3 ③
将③代入①得y=7/2
将y=7/2代入③得x=-3/8
2.(x+y)/2+(x-y)/2=7 ①
4(x+y)-5(x-y)=2 ②
由①得x+y+x-y=14
x=7
将x=7代入②得y=1
3.(s-1)/5=(t+3)/2 ①
s-1/2=(1-t)/2 ②
由②得s=2-t ③
将③代入①得t=-13/7
将t=-13/7代入②得s=27/7
4.(2x-7y-8)二次方+|3x-8y-10|=0
由题意得2x-7y-8=0 ①
3x-8y-10=0 ②
由①得x=(8+7y)/2 ③
将③代入②得y=-4/5
将y=-4/5代入③得x=1/10
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