高一数学解不等式(1)-X²+x+1>0 (2) 9-x²小于或等于0 (3)(x+1)(2-x)小于或等于0 (4)x-1/x²-4大于或等于0 (5)5x+1/x+1<1 (6)x-1/x-2>1/2
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![高一数学解不等式(1)-X²+x+1>0 (2) 9-x²小于或等于0 (3)(x+1)(2-x)小于或等于0 (4)x-1/x²-4大于或等于0 (5)5x+1/x+1<1 (6)x-1/x-2>1/2](/uploads/image/z/8753545-1-5.jpg?t=%E9%AB%98%E4%B8%80%E6%95%B0%E5%AD%A6%E8%A7%A3%E4%B8%8D%E7%AD%89%E5%BC%8F%EF%BC%881%EF%BC%89-X%26%23178%3B%2Bx%2B1%3E0+%EF%BC%882%EF%BC%89+9-x%26%23178%3B%E5%B0%8F%E4%BA%8E%E6%88%96%E7%AD%89%E4%BA%8E0+%EF%BC%883%EF%BC%89%EF%BC%88x%2B1%EF%BC%89%EF%BC%882-x%EF%BC%89%E5%B0%8F%E4%BA%8E%E6%88%96%E7%AD%89%E4%BA%8E0+%EF%BC%884%EF%BC%89x-1%2Fx%26%23178%3B-4%E5%A4%A7%E4%BA%8E%E6%88%96%E7%AD%89%E4%BA%8E0+%EF%BC%885%EF%BC%895x%2B1%2Fx%2B1%EF%BC%9C1+%EF%BC%886%EF%BC%89x-1%2Fx-2%EF%BC%9E1%2F2)
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高一数学解不等式(1)-X²+x+1>0 (2) 9-x²小于或等于0 (3)(x+1)(2-x)小于或等于0 (4)x-1/x²-4大于或等于0 (5)5x+1/x+1<1 (6)x-1/x-2>1/2
高一数学解不等式(1)-X²+x+1>0 (2) 9-x²小于或等于0 (3)(x+1)(2-x)小于或等于0 (4)x-1/x²-4大于或等于0 (5)5x+1/x+1<1 (6)x-1/x-2>1/2
高一数学解不等式(1)-X²+x+1>0 (2) 9-x²小于或等于0 (3)(x+1)(2-x)小于或等于0 (4)x-1/x²-4大于或等于0 (5)5x+1/x+1<1 (6)x-1/x-2>1/2
(1)x²-x-1<0∴(1-√5)/2
(3)(x+1)(x-2)≥0∴x≤-1或者x≥2
(4)转换为:(x-1)(x²-4)≥0但x²4≠0∴-2
(5)(5x+1)/(x+1)-1<0, 4x/(x+1)<0转化为:4x(x+1)<0但x+1≠0∴-1
(1) (1-√5)/2
(3) x∈[-1,2]
(4) x∈(-2,1]∪(2,+∞)
(5) 题目没有括号,认为题目就是5x+(1/x)+1<1,解得: x<0
(6) 同样题目没有括号,认为题目就是x-(1/x)-2>1/2,能解。