解一元二次不等式3x²-x-4>0 X²-x-4>0 x²+3x-4>0 16-8x+x²≤0解一元二次不等式3x²-x-4>0 ,X²-x-4>0 ,x²+3x-4>0 ,16-8x+x²≤0
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 22:07:15
![解一元二次不等式3x²-x-4>0 X²-x-4>0 x²+3x-4>0 16-8x+x²≤0解一元二次不等式3x²-x-4>0 ,X²-x-4>0 ,x²+3x-4>0 ,16-8x+x²≤0](/uploads/image/z/700005-21-5.jpg?t=%E8%A7%A3%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E4%B8%8D%E7%AD%89%E5%BC%8F3x%26%23178%3B-x-4%EF%BC%9E0+X%26%23178%3B-x-4%EF%BC%9E0+x%26%23178%3B%2B3x-4%EF%BC%9E0+16-8x%2Bx%26%23178%3B%E2%89%A40%E8%A7%A3%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E4%B8%8D%E7%AD%89%E5%BC%8F3x%26%23178%3B-x-4%EF%BC%9E0+%2CX%26%23178%3B-x-4%EF%BC%9E0+%2Cx%26%23178%3B%2B3x-4%EF%BC%9E0+%2C16-8x%2Bx%26%23178%3B%E2%89%A40)
解一元二次不等式3x²-x-4>0 X²-x-4>0 x²+3x-4>0 16-8x+x²≤0解一元二次不等式3x²-x-4>0 ,X²-x-4>0 ,x²+3x-4>0 ,16-8x+x²≤0
解一元二次不等式3x²-x-4>0 X²-x-4>0 x²+3x-4>0 16-8x+x²≤0
解一元二次不等式3x²-x-4>0 ,X²-x-4>0 ,x²+3x-4>0 ,16-8x+x²≤0
解一元二次不等式3x²-x-4>0 X²-x-4>0 x²+3x-4>0 16-8x+x²≤0解一元二次不等式3x²-x-4>0 ,X²-x-4>0 ,x²+3x-4>0 ,16-8x+x²≤0
3x²-x-4>0,(3x-4)(x+1)>0,所以 x4/3.解集{x| x4/3}
X²-x-4>0 ,令x^2-x-4=0,解得x=(1±√17)/2,所以解集为{x|x(1+√17)/2}
x²+3x-4>0 ,(x+4)(x-1)>0,x1,解集{x| x1}
16-8x+x²≤0 x^2-8x+16《0,(x-4)^2《0,x=4,解集 {x|x=4}
问题不太清楚啊,那x2前的0是怎么回事
用 几何画板 把图画出来 就知道了
这是不等式组还是要每个都解啊?