2\(3x-1)-3\(x-y)=1 4\(x-y)+3\(x+2y+=1 用加减法接二元一次方程组12点之前 要答案啊!!!!!!!!!!!!!!!!!!!!!
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2\(3x-1)-3\(x-y)=14\(x-y)+3\(x+2y+=1用加减法接二元一次方程组12点之前要答案啊!!!!!!!!!!!!!!!!!!!!!2\(3x-1)-3\(x-y)=14\(x
2\(3x-1)-3\(x-y)=1 4\(x-y)+3\(x+2y+=1 用加减法接二元一次方程组12点之前 要答案啊!!!!!!!!!!!!!!!!!!!!!
2\(3x-1)-3\(x-y)=1 4\(x-y)+3\(x+2y+=1 用加减法接二元一次方程组
12点之前 要答案啊!!!!!!!!!!!!!!!!!!!!!
2\(3x-1)-3\(x-y)=1 4\(x-y)+3\(x+2y+=1 用加减法接二元一次方程组12点之前 要答案啊!!!!!!!!!!!!!!!!!!!!!
代简2*(3x-1)-3*(x-y)=1得x+y=1 (1)
4*(x-y)+3*(x+2y)=1得7x+2y=1 (2)
(2)-(1)*2得5x=-1,从而得到x=-1/5,
代入(1)式得到y=6/5
把题目写清楚