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一、选择题(每题3分,共24分)1.若 x/y=2/3,则下列式子成立的是( ).A.y/(x+y)=5/30 B.(x+y)/x=5/2C.(x+y)/(x-y)=5 D.(x+2)/(y+3)=4/52.若 a:b=3:5,且 b 是 a、c 的比例中项,那么 b:c 的值是( ).A.3:2 B.5:3 C.3:5 D.2:33.下列命题正确的是( ).A.矩形都相似B.等腰直角三角形都相似
First, the multiple-choice questions (each question 3 points, a total of 24 points) 1. If x / y = 2/3, the following formula is established () .Ay / (x + y) = 5 / (x + y) / (xy) = 5 D. (x + 2) / (y + 3) = 4/52 If a: b = 3: 5, and b Is the proportional term for a, c, then the value of b: c is () .A.3: 2 B.5: 3 C.3: 5 D.2: 33. The following proposition is correct () .A. Rectangles are similar B. Isosceles right triangle are similar