18·3×0·25＋5·3／0·4－3·13×2·5,简算

18·3×0·25＋5·3／0·4－3·13×2·5,简算 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? 长为5宽为4高为3的长方形的展开图怎样画?快来帮帮忙呀!急用······················································· 1＋2＋3+4+5········+n,=多少? 解方程 3x²-4x-5=0 急······· 18·76×9·9＋18·76 0·25×16·2×0·4 4·8×9·9 7·09×10·8 －0.8×7.09 4.8×100.1 4.2 ÷3.5 32 求用 N 和 i 表示 x 的方程式：N=5时,i=0······x=0 ,i=1······x=1 ,i=2······x=3 ,i=3······x=1 ,i=4······x=0N=7时,i=0······x=0 ,i=1······x=1 ,i=2······x=3 ,i=3······x=5 ,i=4······x=3 x除以4······3 x除以5······4 x除以6······5x除以4······3 x除以5······4 x除以6······5 求x x²-3x=0 ········ 1*2*3*4*5*6*7*8*9*10·········*50积的末尾一共有多少个0? 俗语和名句的填空1······,自知之明.2······,行必果.3工欲善其事,······.4临渊羡鱼,······.5非学无以广才,······.6······,福兮祸之所伏.7项庄舞剑,······.8······,人以群 这几道奥数题谁会,求2014在哪一行那一列 1 2 3 4 5 10 9 8 7 6 11 12 13 14 15 20 19 18 17 16 求2014哪一行那一列 1 2 3 4 5 6 7 8 9 ···· ····· ·························· 1×2×3×4×5×······×50,其结果后面有几个0? 0~100的素数的答案比如2·3·5·7·11·13······ -1,2,-3,4,-5,6,···1,4,9,16,25···0,3,8,15,24···第一行按什么规律排列?第二三行分别与第一行有 （1）5＋10＋15＋20＋25＋···＋85＋90＋95＋100（2）﹙1＋3＋5＋7＋···＋1991﹚－﹙2＋4＋6＋8＋···＋1990﹚ 3·97＋0·7－1·32＝?脱式计算, 证明1·3·5·····(2n-1)/2·4·6·····2n