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题型:填空题 题类:常考题 难易度:困难
(两个知识点混在一起)3194 10
+ + =18, + =14, + + + =20
=, =, =
①用6个正方形拼成的长方形周长是{#blank#}1{#/blank#}厘米;
②用n个正方形拼成的长方形周长是{#blank#}2{#/blank#}厘米.
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