用如图两条线作长方形的两条边，画出一个长方形，再测量．（1）先估一估，长方形的面积大约是 求西师版小学四年级下册数学期末综合试题
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（1）估测：长方形的长是6厘米、宽是3厘米，则面积大约是6×3=18（平方厘米）；
（2）经过测量可知：长方形的长是6.5厘米、宽是3厘米，
则周长是（6.5+3）×2=19（厘米），
面积是：6.5×3=19.5（平方厘米）；
（3）因为长方形的四个角的度数之和是360°，平角度数是180°，周角的度数是360°，
所以长方形4个角的度数的和等于2个平角，等于1个周角．
故答案为：18；6.5；3；19；19.5；2；1．
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绛旓細杩炴帴涓ゆ潯瀵硅绾垮嵆鍙濡傚浘锛
绛旓細闀挎柟褰㈢敤涓ゆ潯绾鍒嗘垚鍏釜鐩磋 鎴戞潵绛 1涓洖绛 #鐑# 姝﹀ぇ闈栧湪鍐ゥ鐨勮〃鐜,鎬庝箞璇勪环鏈鎭板綋?鎴戞槸椹村瓙ok 2014-10-29 路 TA鑾峰緱瓒呰繃3512涓禐 鐭ラ亾灏忔湁寤烘爲绛斾富 鍥炵瓟閲:1894 閲囩撼鐜:100% 甯姪鐨勪汉:658涓 鎴戜篃鍘荤瓟棰樿闂釜浜洪〉 鍏虫敞 灞曞紑鍏ㄩ儴 宸茶禐杩 宸茶俯杩< 浣犲杩欎釜鍥炵瓟鐨勮瘎浠锋槸? 璇勮...
绛旓細涓鏉＄珫锛屼竴鏉℃枩銆
绛旓細濡傚浘锛氬湪涓鏉＄洿绾夸笂鎵句竴鐐笰锛屼綔瀵硅竟鐨勫瀭绾挎AB锛屽啀鍦ㄨ繖鏉＄洿绾夸笂鎵句竴鐐笴锛屼綔AB鐨勫钩琛岀嚎涓庡彟涓鏉＄洿绾跨浉浜や笌D锛 鍒橝BDC灏辨槸瑕佺敾鐨闀挎柟褰锛
绛旓細涓涓暱鏂瑰舰鍔犱竴鏉＄嚎娈靛鍔2涓洿瑙掑涓嬪浘锛氳繖涓浘涓櫎浜闀挎柟褰㈢殑鍥涗釜瑙掍箣澶栵紝杩樻湁绾挎涓よ竟鐨勪袱涓洿瑙掞紝鎵浠ヤ竴涓暱鏂瑰舰鍔犱竴鏉＄嚎娈靛鍔2涓洿瑙掋
绛旓細濡傚浘锛A鐐瑰潗鏍囦负锛-3锛1锛夛紝B鐐瑰潗鏍囦负锛-3锛-2锛夛紝D鐐瑰潗鏍囦负锛1锛1锛夛紟
绛旓細璁闀挎柟褰㈢殑闀垮拰瀹藉垎鍒负a鍜宐銆傛墍浠ラ暱鏂瑰舰鐨勯潰绉负ab銆侫锛孊鍒嗗埆鏄袱杈圭殑涓偣锛屾墍浠鐨勯偅鏉′笁瑙掑舰鐨勮竟绛変簬1/2a锛孊鐨勯偅鏉¤竟绛変簬1/2b銆傚洜涓轰笁瑙掑舰鏄洿瑙掍笁瑙掑舰锛屼綘闅忎究鍝竴鏉″仛楂橈紝锛堝畠鐨勭洿瑙掑氨鏄鐭╁舰鐨閭ｄ釜瑙掞級锛岄潰绉负(1/2a*1/2b)梅2=1/8ab 鎵浠ラ潰绉瘮涓 1/8ab:1ab=1/8:1 鍗抽槾褰辨槸...
绛旓細濡傚浘锛氬彲灏嗘鏂瑰舰鍒嗘垚涓や釜姝ｆ柟褰(鐧借壊)锛屼笌涓や釜闀挎柟褰(钃濊壊)銆
