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(1 994年1 2月25日)一、选择题 (每小题7分,共42分)1.若口一6O。则＆+6一~/—a z--2a—b+b2等于(A)一2a(C)一26.(B)2a(D)26.《数学教师》1996年第2期(总第134期) 2.有下述三个命题:①对角线垂直且相等的四边形是正方形;②大于直角的角是钝角;⑧平面上两条相交直线所构成的图
(February 25, 1994, February 25) 1. Multiple-choice questions (7 points for each question, for a total of 42 points) 1. If the mouth is a 6O. Then & + 6 a ~ / - a z--2a-b + b2 is equal to (A) - 2a (C) - 26 (B) 2a (D) 26. “Mathematics teacher” in 1996 the second period (general 134) 2. There are the following three propositions: 1 The diagonals of the diagonals that are perpendicular and equal are squares; 2 The angles that are larger than the right angles are obtuse angles; The figure that consists of two intersecting lines on the 8 planes.