用加减消元法解下列方程组:(1)1/2x-2y=71/2x-3y=-8(2)2n-5v=124n+3v=-2(3)(x+y)/3=(x+y)/22x-5y=7

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用加减消元法解下列方程组:(1)1/2x-2y=71/2x-3y=-8(2)2n-5v=124n+3v=-2(3)(x+y)/3=(x+y)/22x-5y=7用加减消元法解下列方程组:(1)1/2x-

用加减消元法解下列方程组:(1)1/2x-2y=71/2x-3y=-8(2)2n-5v=124n+3v=-2(3)(x+y)/3=(x+y)/22x-5y=7
用加减消元法解下列方程组:
(1)1/2x-2y=7
1/2x-3y=-8
(2)2n-5v=12
4n+3v=-2
(3)(x+y)/3=(x+y)/2
2x-5y=7

用加减消元法解下列方程组:(1)1/2x-2y=71/2x-3y=-8(2)2n-5v=124n+3v=-2(3)(x+y)/3=(x+y)/22x-5y=7
1.1式减2式
y=15,x=74
2.1式×2-2式
v=-2,n=1
3.你确定题目没问题吗