校園里有松樹(shù)25棵,柏樹(shù)比松樹(shù)多7棵,楊樹(shù)的棵數(shù)是松樹(shù)和柏樹(shù)總棵數(shù)的2倍,楊樹(shù)有多少棵?
分析:有松樹(shù)25棵,柏樹(shù)比松樹(shù)多7棵,根據(jù)加法的意義,柏樹(shù)有25+7棵,則松樹(shù)與柏?cái)?shù)共有25+7+25棵,又樹(shù)的棵數(shù)是松樹(shù)和柏樹(shù)總棵數(shù)的2倍,根據(jù)乘法的意義,用松樹(shù)與柏?cái)?shù)的總棵數(shù)乘2,即得楊樹(shù)有多少棵.
解答:解:(25+7+25)×2
=57×2
=104(棵)
答:楊樹(shù)有104棵.
點(diǎn)評(píng):首先根據(jù)加法的意義求出松樹(shù)與柏樹(shù)的總棵數(shù)是完成本題的關(guān)鍵.
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科目:小學(xué)數(shù)學(xué) 來(lái)源: 題型:022

校園里有楊樹(shù)20棵,松樹(shù)25棵.

(1)楊樹(shù)的棵數(shù)是松樹(shù)的百分之幾?

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(2)松樹(shù)的棵數(shù)是楊樹(shù)的百分之幾?

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(3)松樹(shù)的棵數(shù)比楊樹(shù)多百分之幾?

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(4)楊樹(shù)的棵數(shù)比松樹(shù)少百分之幾?

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(5)楊樹(shù)的棵數(shù)是這兩種樹(shù)棵數(shù)的百分之幾?

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(6)松樹(shù)的棵數(shù)是這兩種樹(shù)棵數(shù)的百分之幾?

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A20÷(2025)

B(2520)÷20

C20÷25

D(2520)÷25

E25÷(2025)

F25÷20

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