小芳家栽3行桃樹(shù)、8行蘋(píng)果樹(shù)和4行梨樹(shù).桃樹(shù)每行7棵,蘋(píng)果樹(shù)每行6棵,梨樹(shù)每行5棵(根據(jù)問(wèn)題先列表整理再解答)
(1)桃樹(shù)和梨樹(shù)一共有多少棵?
(2)蘋(píng)果樹(shù)比桃樹(shù)多多少棵?
分析:(1)用桃樹(shù)的行數(shù)乘每行的棵數(shù)加上梨樹(shù)的行數(shù)乘每行的棵數(shù)即可.
(2)用蘋(píng)果的行數(shù)乘每行的棵數(shù)減去桃樹(shù)的行數(shù)乘每行的棵數(shù)即可.
解答:解:根據(jù)數(shù)據(jù)列表如下:

(1)3×7+4×5,
=21+20,
=41(棵);
(2)8×6-3×7,
=48-21,
=27(棵);
答:(1)桃樹(shù)和梨樹(shù)一共有41棵;(2)蘋(píng)果樹(shù)比桃樹(shù)多27棵.
點(diǎn)評(píng):此題的關(guān)鍵是用行數(shù)乘每行的棵數(shù)計(jì)算出一類果樹(shù)的棵數(shù).
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