初二数学解方程
2017-04-20
展开全部
好多年了,试试看。
x = 5- 2y
代入
(5-2y)2 -2(5-2y)*y + y2 -1 = 0
25 - 10y + 4y2 -10y + 4y2 -1 = 0
9y2 -30y + 24 = 0
3y2 - 10y + 8 =0
(3y-4)*(y-2) = 0
1. y = 4/3 x = 7/3
2. y=2 x = 1
x = 5- 2y
代入
(5-2y)2 -2(5-2y)*y + y2 -1 = 0
25 - 10y + 4y2 -10y + 4y2 -1 = 0
9y2 -30y + 24 = 0
3y2 - 10y + 8 =0
(3y-4)*(y-2) = 0
1. y = 4/3 x = 7/3
2. y=2 x = 1
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