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初一数学不等式题在线等！快啊

2024-12-14 11:32:48

推荐回答（4个）

回答1：

解答：由2X-3Y=4得到：X=2-3/2Y，带入后面的不等式中得到：2-3/2Y+2Y大于1，解得Y大于-2；同理由2X-3Y=4得到：Y=（2X-4）/3,带入后面的不等式中得到：X+2（2X-4）/3大于1，解得X大于11/7.

回答2：

因为2x-3y=4，所以2x=4+3y，即x=(4+3y)/2把它代入x+2y大于1可得：(4+7y)/2>1所以4+7y>2 7y>—2故y>—2/7而x=（4+3y）/2具体要看y的变化。可能题目有问题，因为不能具体求出来的

回答3：

因为x+2y﹥1所以（2x+4y﹥2）式a（2x-3y=4）式b，a-b=7y＞-2，y＞-2／7；x＞11／7

回答4：

算出x=2+3/2 y，再代入2x-3y=4中，就能求出2+7/2 y>1,计算出结果y小于- 2/7 y.

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