果園里有蘋(píng)果樹(shù)20棵,梨樹(shù)15棵.
(1)蘋(píng)果樹(shù)比梨樹(shù)多多少棵?
(2)梨樹(shù)比蘋(píng)果樹(shù)少多少棵?
(3)蘋(píng)果樹(shù)的棵數(shù)比梨樹(shù)多幾分之幾?
(4)梨樹(shù)的棵數(shù)比蘋(píng)果樹(shù)少幾分之幾?
分析:(1)用蘋(píng)果樹(shù)的棵樹(shù)-梨樹(shù)的棵數(shù)解答,
(2)用蘋(píng)果樹(shù)的棵樹(shù)-梨樹(shù)的棵數(shù)解答,
(3)先求出蘋(píng)果樹(shù)比梨樹(shù)多的棵樹(shù),再用多的棵樹(shù)÷梨樹(shù)的棵數(shù)解答,
(4)先求出蘋(píng)果樹(shù)比梨樹(shù)多的棵樹(shù),再用少的棵樹(shù)÷蘋(píng)果樹(shù)的棵數(shù)解答.
解答:解:(1)20-15=5(棵),
答:蘋(píng)果樹(shù)比梨樹(shù)多5棵.

(2)20-15=5(棵),
答:梨樹(shù)比蘋(píng)果樹(shù)少5棵,

(3)(20-15)÷15,
=5÷15,
=
1
3
,
答:蘋(píng)果樹(shù)的棵數(shù)比梨樹(shù)多
1
3
,

(4)(20-15)÷20,
=5÷20,
=
1
4
,
答:梨樹(shù)的棵數(shù)比蘋(píng)果樹(shù)少
1
4
點(diǎn)評(píng):解答此類題目的關(guān)鍵是:找出解決問(wèn)題需要的數(shù)量間的關(guān)系,代入數(shù)據(jù)即可解答.
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