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来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/10 14:08:39

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6.x=50 y=6cm
7.a=90 b=4cm
8.x=36
9.（1）x=4cm （2）17-3乘以4=5cm
10.内角和=（9 —2）乘以180=1260°
每个内角度数=1260除以9=140°
11.
内角和=（边数----2)乘以180

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