Question

（2008?淮安模擬）根據(jù)“桃樹(shù)棵數(shù)是梨樹(shù)棵數(shù)的

5

7

”可以想到：

梨樹(shù)的棵數(shù)

×

5

7

=

桃樹(shù)的棵數(shù)

；

梨樹(shù)的棵數(shù)

×（1-

5

7

）=

桃樹(shù)比梨樹(shù)少的棵數(shù)

．

Answer 1

分析：把梨樹(shù)的棵數(shù)看成單位“1”，桃樹(shù)棵數(shù)是梨樹(shù)棵數(shù)的

5

7

，桃樹(shù)比梨樹(shù)少1-

5

7

，由此解決問(wèn)題．

解答：解：把梨樹(shù)的棵數(shù)看成單位“1”，

5

7

表示桃樹(shù)的棵數(shù)占單位“1”的幾分之幾，
所以梨樹(shù)的棵數(shù)×

5

7

=桃樹(shù)的棵數(shù)；
1-

5

7

，表示桃樹(shù)比梨樹(shù)少幾分之幾，所以梨樹(shù)的棵數(shù)×（1-

5

7

）=桃樹(shù)比梨樹(shù)少的棵數(shù)．
故答案為：梨樹(shù)的棵數(shù)，桃樹(shù)的棵數(shù)；梨樹(shù)的棵數(shù)，桃樹(shù)比梨樹(shù)少的棵數(shù)．

點(diǎn)評(píng)：此題屬于求一個(gè)數(shù)的幾分之幾是多少，單位“1”已知，用乘法解答．