Question

16．果園里有桃樹(shù)和杏樹(shù)共210棵，杏樹(shù)的棵數(shù)是桃樹(shù)的$\frac{2}{5}$．求兩種樹(shù)各有多少棵，設(shè)（　�。�為x列方程簡(jiǎn)便．

• A． 杏樹(shù)的棵數(shù)
• B． 桃樹(shù)的棵數(shù)
• C． 一共的棵數(shù)

Answer 1

分析 因?yàn)橐阎�杏�?shù)的棵數(shù)是桃樹(shù)的$\frac{2}{5}$，所以設(shè)桃樹(shù)有x棵，則杏樹(shù)有$\frac{2}{5}$x棵．根據(jù)等量關(guān)系：桃樹(shù)的棵數(shù)+杏樹(shù)的棵數(shù)=210棵，列方程解答即可．

解答 解：因?yàn)橐阎�杏�?shù)的棵數(shù)是桃樹(shù)的$\frac{2}{5}$，所以設(shè)桃樹(shù)有x棵，則杏樹(shù)有$\frac{2}{5}$x棵．
x+$\frac{2}{5}$x=210
    $\frac{7}{5}$x=210
       x=150，
210-150=60（棵），
答：杏樹(shù)有60棵，桃樹(shù)有150棵．
故選：B．

點(diǎn)評(píng) 本題考查了列方程解應(yīng)用題，關(guān)鍵是根據(jù)等量關(guān)系：桃樹(shù)的棵數(shù)+杏樹(shù)的棵數(shù)=210棵，列方程．