{2x+5y=13z+1000 {3x+3z=9y {6y+8z=5x-6000 要详细过程,帮我解方程
问题描述：
{2x+5y=13z+1000 {3x+3z=9y {6y+8z=5x-6000 要详细过程,帮我解方程
{2x+5y=13z+1000
{3x+3z=9y
{6y+8z=5x-6000
要详细过程，帮我解方程
答
①2x+5y-13z=1000②3x-9y+3z=0③5x-6y-8z=6000将②式除以3得：④x-3y+z=0①-2×④得：⑤11y-15z=1000③-5×④得：⑥9y-13z=60009×⑤-11×⑥得：8z=-57000,即⑦z=-7125将⑦代入⑥得：⑧y=-9625将⑦⑧代入④得：x=-21...