七年级数学上册第六章整式的加减6.2《同类项》随堂练习(新版)青岛版.doc

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16.2 同类项一、判断题1 xy42( ) 2 xyxy3( )3 2( ) 4 122( )二、解答题1如右图,把同类项用直线连上2合并下面各式中的同类项(1) aa36942;(2) xyx;(3) 62542x;(4) yxy3371;(5) .10.1.0.2.02x3如图,求阴影部分的面积4求下面各代数式的值(1) 22245yxyx,其中 .2,1yx(2) abab3,其中 b5按给的例子把运算结果输出来2参考答案一、1 2 3 4 二、12 (1) 25a, (2) 3x, (3) 102xa, (4) 223xy,(5) .9040x3 b2 (提示:阴影部分面积: abb32)4 (1)19 (提示:先合并同类项) (2) 435答图

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