下列不等式:①x²+3x-2>0和x²+3x-4>0②4x+5/(x+3)>8+5/(x+3)和4x>8;③4x+5/(x-3)>8+5/(x-3)和4xA①和② B.①和③ C.②和③ D②③④下列不等式中:①x²+3x-2>0和x²+3x-4>0; ②4x+5/(
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![下列不等式:①x²+3x-2>0和x²+3x-4>0②4x+5/(x+3)>8+5/(x+3)和4x>8;③4x+5/(x-3)>8+5/(x-3)和4xA①和② B.①和③ C.②和③ D②③④下列不等式中:①x²+3x-2>0和x²+3x-4>0; ②4x+5/(](/uploads/image/z/1639697-41-7.jpg?t=%E4%B8%8B%E5%88%97%E4%B8%8D%E7%AD%89%E5%BC%8F%EF%BC%9A%E2%91%A0x%26sup2%3B%2B3x-2%3E0%E5%92%8Cx%26sup2%3B%2B3x-4%3E0%E2%91%A14x%2B5%2F%28x%2B3%29%3E8%2B5%2F%28x%2B3%29%E5%92%8C4x%3E8%3B%E2%91%A24x%2B5%2F%28x-3%29%3E8%2B5%2F%28x-3%29%E5%92%8C4xA%E2%91%A0%E5%92%8C%E2%91%A1+++++++++B.%E2%91%A0%E5%92%8C%E2%91%A2+++++++++++++C.%E2%91%A1%E5%92%8C%E2%91%A2++++++++D%E2%91%A1%E2%91%A2%E2%91%A3%E4%B8%8B%E5%88%97%E4%B8%8D%E7%AD%89%E5%BC%8F%E4%B8%AD%EF%BC%9A%E2%91%A0x%26sup2%3B%2B3x-2%3E0%E5%92%8Cx%26sup2%3B%2B3x-4%3E0%3B++%E2%91%A14x%2B5%2F%28)
下列不等式:①x²+3x-2>0和x²+3x-4>0②4x+5/(x+3)>8+5/(x+3)和4x>8;③4x+5/(x-3)>8+5/(x-3)和4xA①和② B.①和③ C.②和③ D②③④下列不等式中:①x²+3x-2>0和x²+3x-4>0; ②4x+5/(
下列不等式:①x²+3x-2>0和x²+3x-4>0②4x+5/(x+3)>8+5/(x+3)和4x>8;③4x+5/(x-3)>8+5/(x-3)和4x
A①和② B.①和③ C.②和③ D②③④
下列不等式中:①x²+3x-2>0和x²+3x-4>0; ②4x+5/(x+3)>8+5/(x+3)和4x>8; ③4x+5/(x-3)>8+5/(x-3)和4x>8; ④(x+3)/(2-x)>0和(x+3)(2-x)>0.
不等价的是那几项
A①和② B.①和③ C.②和③ D②③④
下列不等式:①x²+3x-2>0和x²+3x-4>0②4x+5/(x+3)>8+5/(x+3)和4x>8;③4x+5/(x-3)>8+5/(x-3)和4xA①和② B.①和③ C.②和③ D②③④下列不等式中:①x²+3x-2>0和x²+3x-4>0; ②4x+5/(
B
①:很明显两个不等式不同,前面是-2,后面是-4
②:解第一个,因为x+3在分母,所以x不能等于-3,移项,化简得x>2,
所以最后化简为x>2(因为在此范围内x肯定不能等于-3),与后面的式子相同,所以等价
③:和②类似但有所不同,因为x-3在分母,所以x不能等于3,移项,化简得x>2,
所以最后化简为x>2而且x≠3(为了使分母有意义,不能等于3),与后面的式子不相同,所以不等价
④:两者结果均为-3
B,