0.9999×0.7+0·1111×2·7的简便方法

0.9999×0.7+0·1111×2·7的简便方法 有理数a、b在数轴上位置如图所示,试化简 |a-b|-|a+b|+2|b-2a|··········································b 0 a 计算下面行列式,2 1 0 0······0 01 2 1 0······0 00 1 2 1 ·····0 0············0 0 0 0······2 10 0 0 0······1 0.9999······化成分数形式是多少?请解释说明. 逻辑运算 1010·1111=? 函数F(X)=【①2x^3+3x^2+1（x≤0）,②e^ax（x>0）】在区间[-2,2]上的最大值为2,则a的取值范围································F(x)为分段函数，跪求大哥帮解答··············· 算术平方根是它本身的数只有1和0,（1）算术平方根是它本身的数只有1和0.································（ ）（2）平方根是它本身的数只有1和0.·················· 0~100的素数的答案比如2·3·5·7·11·13······ ∑(Xij-7)=?i=0,1,2,3,········j=0,1,2,3·······如何计算 0.9999*0.7+0.1111*0.7=? 6·2×0·99用简算 7+77+777+······+77······77(1111个7)后两位数字是 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 为什么三分之一乘三等于一而0.333.×3 =0.9999.≠1呢?1／3=0·333333. 急·····················1+2+3+...+999=? 1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········? 三道有关定积分题,人教版,55页的要详解··········计算定积分1.∫[2,1] (x^2-2x-3/x) dx2.∫[2,1] (e^2-2/x) dx3.∫[π/2,0] (3x+sinx) dx在线等·······拜托啦············ 纸鹤数量的意义比如说 1只纸鹤,代表······· 2只纸鹤,代表······· ······················· ···························· ·················· 越多越好,