(1)3x+3y=8; 2x-2y=1 (2) 3x-5z+6; x+4z=-15 (3) m-n=2; 2m+3n=14 (4) 2x+y=4; 3x-2y=13全是二元一次方程,用代入消元法求.第二题是3x-5z=6;x+4z=-15我放假了(我没学二元一次方程)
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