(1)x^2-4>=0,即x>=2,x<=-2
x^2-4<=x+2
x^2-x-6<=0
(x-3)(x+2)<=0
-2<=x<=3
即2<=x<=3,x=-2.
(2)x^2-4<0,即-2
x^2+x-2>=0
(x+2)(x-1)>=0
x>=1,x<=-2
即1<=x<2.
综上所述,x=-2或1<=x<=3
不等式x的二次方减4的绝对值小于等于x加2的解题步骤
不等式x的二次方减4的绝对值小于等于x加2的解题步骤
数学人气：250 ℃时间：2019-10-19 16:37:06
优质解答
|X^2-4|<=x+2
(1)x^2-4>=0,即x>=2,x<=-2
x^2-4<=x+2
x^2-x-6<=0
(x-3)(x+2)<=0
-2<=x<=3
即2<=x<=3,x=-2.
(2)x^2-4<0,即-2
x^2+x-2>=0
(x+2)(x-1)>=0
x>=1,x<=-2
即1<=x<2.
综上所述,x=-2或1<=x<=3
(1)x^2-4>=0,即x>=2,x<=-2
x^2-4<=x+2
x^2-x-6<=0
(x-3)(x+2)<=0
-2<=x<=3
即2<=x<=3,x=-2.
(2)x^2-4<0,即-2
x^2+x-2>=0
(x+2)(x-1)>=0
x>=1,x<=-2
即1<=x<2.
综上所述,x=-2或1<=x<=3
我来回答
类似推荐
猜你喜欢
- 1已知方程3X-5Y=2,用含X的代数式表示Y,则Y=?
- 2半径为5cm的⊙O中，两条平行弦的长度分别为6cm和8cm，则这两条弦的距离为多少？
- 3I think she will try_____(learn)maths well.
- 4如右图,紧靠小溪有一块梯形的苗圃,它的面积是0.8公顷.现在要在相邻小溪的三边围上护栏,并要求只测量一
- 5求“养宠物的好处与坏处”的英语作文
- 6少量的二氧化碳通入次氯酸钠中到底生成碳酸钠还是碳酸氢钠?
- 7have a little in common have a few in common have few in commo have many in common
- 8求（前）赤壁赋中 通假字 一词多义 词类活用 古今异义 特殊句式
- 9《确定起跑线》76页例题答案
- 10尽兴 < >