2x-3y=5x+2y=1 求xy的值
人气：113 ℃ 时间：2020-01-28 02:05:33
解答
联立2x-3y=1和5x+2y=1
解出x=5/19.y=-3/19
所以xy=-15/361
推荐
- 已知xy^2=-2求xy（2x^3y^7+5x^2y^5-y)的值
- 已知xy^2=-2求xy（2x^3y^7+5x^2y
- 试说明代数式x^3y^3-1/2x^2y+y^2-2x^3y^3+0.5x^2y+y^2+x^3y^3-2y^2-3的值与字母xy的取值无关
- 若x-y=4,xy=1,则(2x+y-2xy)-(3x+2y+xy)-(4xy+3y-5x)=
- 已知xy满足2x+y/2=5x+2y/4=t,求代数式x+2y+t/2x-3y+7t的值
- 1选A,2选B,我不确定答案,
- Would you like to fly a kite with me?Sorry,I h_______ ever have time for a game
- 取三支干净的小试管,试管A盛有开始蒸馏出的液体,试管B装有蒸馏一段时间后收集的,试管C放入没蒸馏的硬水
猜你喜欢
