—Speak less of your role in the game,and more of ________ your teammates have done. —I will. A.what B.which C.why D.that 答案:A如图,在△ABC中,点D、E分别在边AB、AC上,如果DE∥BC,且∠DCE=∠B,那么下列说法中,错误的是( )A. △ADE∽△ABC B. △ADE∽△ACD C. △ADE∽△DCB D. △DEC∽△CDB
C
【解析】试题解析:∵DE∥BC,
∴△ADE∽△ABC,∠BCD=∠CDE,∠ADE=∠B,∠AED=∠ACB,
∵∠DCE=∠B,
∴∠ADE=∠DCE,
又∵∠A=∠A,
∴△ADE∽△ACD;
∵∠BCD=∠CDE,∠DCE=∠B,
∴△DEC∽△CDB;
∵∠B=∠ADE,
但是∠BCD<∠AED,且∠BCD≠∠A,
∴...