GRE考试

【单选题】If 3^a=b and 3^c=d,then bd=
A、3^ac
B、3^a+c(c) 6^a+cD、9^acE、9^a+c
网考网参考答案：B
网考网解析：
bd = (3°)(3°) = 3 a + c . [KEY FACT A16] **Use TACTIC 2, Chapter 11. Pick easy-to-use numbers for a and c; a = 1 and c = 2, for example. Then, b = 3 1 = 3 and d = 3 2 = 9, so bd = 27. Check the choices. Only 3 a+c wort document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>