Question

18．杏樹(shù)的棵樹(shù)比桃樹(shù)少$\frac{1}{7}$，那么下列說(shuō)法不正確的是（　　）

• A． 杏樹(shù)的棵數(shù)是桃樹(shù)的$\frac{6}{7}$
• B． 桃樹(shù)棵數(shù)-桃樹(shù)棵數(shù)×$\frac{1}{7}$=杏樹(shù)的棵數(shù)
• C． 桃樹(shù)的棵數(shù)比杏樹(shù)多$\frac{1}{7}$

Answer 1

分析 把桃樹(shù)的棵數(shù)看作單位“1”，則杏樹(shù)的棵數(shù)是桃樹(shù)棵數(shù)的1-$\frac{1}{7}$=$\frac{6}{7}$，即桃樹(shù)棵數(shù)-桃樹(shù)棵數(shù)×$\frac{1}{7}$=杏樹(shù)的棵數(shù)，桃樹(shù)的棵數(shù)比杏樹(shù)多$\frac{1}{7}$÷$\frac{6}{7}$=$\frac{1}{6}$，據(jù)此解答即可．

解答 解：杏樹(shù)的棵樹(shù)比桃樹(shù)少$\frac{1}{7}$，杏樹(shù)的棵數(shù)是桃樹(shù)的$\frac{6}{7}$，A正確；
桃樹(shù)棵數(shù)-桃樹(shù)棵數(shù)×$\frac{1}{7}$=杏樹(shù)的棵數(shù)，即桃樹(shù)棵數(shù)×（1-$\frac{1}{7}$）=杏樹(shù)棵數(shù)，B正確；
$\frac{1}{7}$÷$\frac{6}{7}$=$\frac{1}{6}$，桃樹(shù)的棵數(shù)比杏樹(shù)多$\frac{1}{6}$，C錯(cuò)誤；
故選：C．

點(diǎn)評(píng) 解答此題的關(guān)鍵是：用桃樹(shù)的棵數(shù)表示出杏樹(shù)的棵數(shù)，再進(jìn)一步解答．