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一、选择题 1．要使方程组(?)3x+2y=a,2x+3y=2的解是一对异号的数,则a的取值范围是( ) (A)4/33． (D)a<4/3或a>3． 2．一块含30°角的直角三角板(如图1),它的斜边AB=8cm,里面空心△DEF的各边与
First, multiple choice questions 1. To make the equation (?) 3x + 2y = a, 2x + 3y = 2 solution is a pair of different numbers, then the range of a is () (A) 4/3 3. (D)a<4/3 or a>3. 2. A right angle triangle plate with a 30° angle (as shown in Fig. 1) has a hypotenuse of AB=8cm and the inside of the hollow △DEF