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一、选择题(共60分,每小题3分)1.计算84÷(-7)等于( ).(A)-12 (B)12 (C)-14 (D)142.如果两个相似三角形周长的比为4∶9,那么这两个相似三角形对应边的比为( ).(A)2∶3 (B)4∶9(C)16∶81(D)9∶
First, multiple-choice questions (a total of 60 points, each small question 3 points) 1. Calculate 84 ÷ (-7) equal to (). (A) -12 (B) 12 (C) -14 (D) 142. If the ratio of the two similar triangles is 4: 9, then the ratio between the two corresponding triangles is (). (A) 2: 3 (B) 4:9 (C) 16:81 (D) 9: