45*55+46*54+47*53+48*52+49*51=?

45 46 47 48 49 50 51 52 53 54 55用简便计算怎样做 45*55+46*54+47*53+48*52+49*51=? 46、47、48、49、50、51、52、53、54、55 浙江教育出版社 37,38,39,46,47,48,52,53,54,55,56,57, 第46,47,48,49,50,51,52,53,54,55,56,57 谁有星海镖师46,47 ,48,49,50,51,52,53,54,55 35+36-37-38+39+40-41-42+43+44-45-46+47+48-49-50+51+52-53-54+55+56-57-5 谁能帮我算一下以下这些数的标准差,我感激不尽,有钱48,48,42,50,61,44,43,51,46,46,51,46,50,45,52,54,51,57,55,48,49,48,53,48,56,55,57,42,54,49,47,60,51,51,44,41,49,53,52,49,61,58,52,54,50 用简便方法计算49+51+53+47+48+50+49+52+46+51+54+55+51+53+47+50+49+51+56+48的和 42,44,57,45,66,55,48 44,51,47,60,54,48,53 平均数都是51s²=？ vba 建立一个二维数组如下：hz=[{1,6,37,38,39,40;2,11,37,41,42,43;3,16,38,41,44,45;4,21,39,42,44,46;5,26,40,43,45,46;7,12,37,47,48,49;8,17,38,47,50,51;9,22,39,48,50,52;10,27,40,49,51,52;13,18,41,47,53,54;14,23,42,48,53,55;15,28,43,49,54,55;1 46 47 51 53 54 期末小状元五年级上册数学43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64页的答案 初中文言文读本43～59译文43 快马加鞭 44 苛政猛于虎 45关伊子教射 46孙叔敖纳言 47扁鹊见秦王 48百发百中 49不死之药 50出裘发栗 51子罕弗受玉 52唇亡齿寒 53腹䵍杀子 54指鹿为马 55多多益善 50×50+49×51+48×52+47×53+46×54=?如何巧算 46+47+48+49+50+51+52+53+54= ( ）乘（ ）等于（ ） 找规律算一算49+53+47+48+51+54+52+46= 46 47 48 49 51 52 54 55 57课的题目如果还有内容的话更好！人教版的！