Question

20．根據(jù)圖所示，下面說(shuō)法正確的是（　　）
①桃樹(shù)與梨樹(shù)棵樹(shù)的比是4：3
②梨樹(shù)的棵樹(shù)是桃樹(shù)的$\frac{4}{3}$
③桃樹(shù)占兩種果樹(shù)總棵樹(shù)的$\frac{3}{7}$
④梨樹(shù)的棵樹(shù)比桃樹(shù)多$\frac{1}{4}$．

• A． ①②
• B． ②③
• C． ③④D、②④

Answer 1

分析 由圖知，桃樹(shù)的棵數(shù)為3份，梨樹(shù)棵數(shù)為4份，①桃樹(shù)與梨樹(shù)棵樹(shù)的比是3：4；②用梨樹(shù)的棵數(shù)除以桃樹(shù)的棵數(shù)判斷即可；③用桃樹(shù)的份數(shù)數(shù)以?xún)煞N果樹(shù)總的總份數(shù)判斷即可；④用梨樹(shù)的份數(shù)減去桃樹(shù)的份數(shù)，再除以桃樹(shù)的份數(shù)即可．

解答 解：由圖知，桃樹(shù)的棵數(shù)為3份，梨樹(shù)棵數(shù)為4份，
①桃樹(shù)與梨樹(shù)棵樹(shù)的比是3：4；
②梨樹(shù)的棵樹(shù)是桃樹(shù)的$\frac{4}{3}$；
③桃樹(shù)占兩種果樹(shù)總棵樹(shù)的3÷（3+4）=$\frac{3}{7}$；
④梨樹(shù)的棵樹(shù)比桃樹(shù)多（4-3）÷3=$\frac{1}{3}$，
故選：B．

點(diǎn)評(píng) 本題考查了比的應(yīng)用，關(guān)鍵是得出桃樹(shù)的棵數(shù)為3份，梨樹(shù)棵數(shù)為4份．