解方程:x=2y-1 x+3y=6
问题描述:
解方程:x=2y-1 x+3y=6
答
x = 2 y - 1①x + 3 y = 6 ②由 ① 得:x - 2 y = - 1③② - ③ 得:5 y = 7 y = 7 / 5 代入 ①得: x = 2 × 7 / 5 - 1 = 14 / 5 - 1 = 9 / 5∴ x = 9 / 5 y = 7 / 5...