如圖是林場(chǎng)育苗基地樹(shù)苗情況統(tǒng)計(jì)圖:
(1)柳樹(shù)有3500棵,則樹(shù)苗的總數(shù)是多少?
(2)楊樹(shù)和槐樹(shù)分別有多少棵?
(3)松樹(shù)比柏樹(shù)多百分之幾?
分析:(1)根據(jù)統(tǒng)計(jì)圖可知柳樹(shù)占樹(shù)苗總數(shù)的25%,根據(jù)已知一個(gè)數(shù)的百分之幾是多少求這個(gè)數(shù),用除法解答.
(2)根據(jù)一個(gè)數(shù)乘百分?jǐn)?shù)的意義,直接用乘法解答.
(3)屬于求一個(gè)數(shù)比另一個(gè)數(shù)多百分之幾,把被比的數(shù)量柏樹(shù)的棵數(shù)看作單位“1”(作除數(shù)),用除法解答.
解答:解:(1)3500÷25%,
=3500÷0.25,
=14000(棵);

(2)楊樹(shù):14000×33%,
=14000×0.33,
=46200(棵);
槐樹(shù):14000×17%,
=14000×0.17,
=23800(棵),

(3)(15%-10%)÷10%
=0.05÷0.1,
=50%;
答:(1)這些樹(shù)苗的總數(shù)是14000棵;(2)楊樹(shù)有46200棵,槐樹(shù)有23800棵;(3)松樹(shù)比柏樹(shù)多50%.
點(diǎn)評(píng):此題主要考查根據(jù)統(tǒng)計(jì)圖提供的信息,解決有關(guān)的實(shí)際問(wèn)題.
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