2x-2y-2=0① 4x-3y-8=0② ②-①×2→y - 4=0→y=4 把y=4代入①得2x-10=0 →x=5 6x-3y=-5 ① 4x-9y+1=0 ② ①×3-②得 14x-1=-15 →14x=-14 →x=-1 把 x=-1代入①得 -6-3y=-5 →3y=-1 →y=-1/3
用加减法解下列方程组:2x-2y-2=0,4x-3y-8=0 6x-3y=-5,4x-9y+1=0..
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