二元一次方程(用代入消元法解聯立方程)?
回答 (2)
✔ 最佳答案
二元一次方程(用代入消元法解聯立方程)?
x-4y-5=-2x-6y=-1
Sol
X-4y-5=-1
x=4y+4
-2x-6y=-1
-2(4y+4)-6y=-1
-14y-8=-1
-14y=7
y=-1/2
x=4y+4=4*(-1/2)=4=2
x - 4y = 4
3x + 2y = 5
x = 2 , y= -1 / 2 #
收錄日期: 2021-04-24 07:35:33
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