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一、精心选一选(每小题3分,共24分)1.下列不等式中,一定成立的个数有( ).①若 a>b,则1/a<1/b;②若|m|>|n|,则m>n;③若-10,则 y~2>y.A.1个 B.2个 C.3个 D.4个2.不等式2(4x-1)≥5(2x-1)-3的正整数的个数是( ).A.4个 B.3个 C.2个 D.1个3.已知 a<0,b>0,a+b<0,那么下列关系中正确的是( ).A.a>b>-b>-a B.a>-a>b>-bC.b>a>-b>-a D.-a>b>-b>a4.如果不等式组3m无解,那么 m 的取值范围是( ).
First, a carefully selected election (each small question 3 points, a total of 24 points) 1. The following inequalities, the number must be established (). ① If a> b, then 1 / a <1 / b; If m> n |, then m> n; If 1 0, then y ~ 2> yA1 个 B.2 C.3 D.4 2. The number of positive integers of inequality 2 (4x-1) ≥5 (2x-1) -3 is () .A.4 B.3 C.2 D.1.3. It is known that a 0, a + b <0, then the correct relationship is () b> -b> a4. If the inequality group 3 m has no solution, the range of m is ().