单击此处编辑母版标题 样式单击此处编辑母版副标题样式*1环形的面积对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have口算8 10 5 7对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we haveo两个圆的圆心在同一个点上。 （同心圆）两个圆间的距离处处相等。从大圆内取出一个小的同心圆,剩下的图形叫做 环形.对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have想一想，要求环形的面积 ，需要知道那些条件？oo对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have环形面积环形面积=S=S大圆大圆S S小圆小圆= = RR2 2 r r2 2= = (RR2 2 r r2 2) )= = （ R+ R+ r r）（ R- R- r r）对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have6cm4cm环形外圆面积：3.14623.1436113.04（2）内圆面积：3.14423.141650.24（ 2 ）环形的面积：113.0450.2462.8（ 2 ）对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have（1）在圆内剪去一个小圆就成为一个圆环。 （2）一个环形，外圆半径是4厘米，内圆直径是2厘米，计算这个环形的面积列式为： 3.14423.1422（ ）（ ）判断对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have4cm5cm5cm对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have求下面各环形的面积。（单位：分米）6346对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have1、一个圆环内直径是10厘米，外直径 是12厘米。这个圆环的面积是多少？2、一个圆环，内圆半径是3厘米，环宽 2厘米。这个圆环的面积是多少？3、一个圆环，外圆半径是6厘米，环宽 1厘米。这个圆环的面积是多少？对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have（1）一个直径20厘米的圆纸片 ，在它的正中心剪掉一个半径6 厘米的圆，剩下部分面积是多少 平方厘米？对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have（2）在一个半径是4米的圆形花园 四周修一条宽1米的小路。小路的面 积是多少平方米？（3）在一个直径是6米的圆形花园 四周修一条宽1米的小路。小路的面 积是多少平方米？对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have 1.电动火车玩具有一圆 形跑道，这个跑道外圆 半径是40CM，内圆半 径是32CM，这个玩具 跑道的面积是多少平方 厘米？对于闪光灯，很多人是恐惧的。同时驾驭两三灯，甚至五灯，的确是很难。但是如果仅仅只是一灯的话，问题就简单很多。更何况即便是，一人一灯Changing the inequality into equality under what condition is the current research key point. This paper uses the and its elementary operation corresponds the partitioned matrix, prove that when satisfy the certain condition, we have2.一个圆环的内圆半 径是5厘米，环宽2厘 米，这个圆环面积是 多少平方