用加减消元法解答
问题描述:
用加减消元法解答
0.6x-0.4y=1.1
0.2x-0.4y=2.3
答
0.6x-0.4y=1.1 (1)
0.2x-0.4y=2.3 (2)
(1)-(2)
0.6x-0.4y-0.2y+0.4y=1.1-2.3
0.4x=-1.2
x=-3
代入(1)
y=(0.6x-1.1)/0.4=-7.25