三元一次方程{3x-2z=1,3z+2y=2,3y-x=-18细解
问题描述:
三元一次方程{3x-2z=1,3z+2y=2,3y-x=-18细解
答
数学之美团为你解答3x - 2z = 1 ①3z+2y = 2 ②3y - x = -18 ③由③得 x = 3y +18代入①得3(3y+18) - 2z = 1 即 9y - 2z = - 53 ④②×2:6z+4y = 4④×3:27y - 6z = - 159两式相加31y = - 155y = - 5x = 3y +18 = ...