1x1!+2x2!+3x3!+.2008x2008!=
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1x1!+2x2!+3x3!+.2008x2008!=1x1!+2x2!+3x3!+.2008x2008!=1x1!+2x2!+3x3!+.2008x2008!=n*n!=[(n+1)-1]*n!=(
1x1!+2x2!+3x3!+.2008x2008!=
1x1!+2x2!+3x3!+.2008x2008!=
1x1!+2x2!+3x3!+.2008x2008!=
n*n!
=[(n+1)-1]*n!
=(n+1)*n!-1*n!
=(n+1)!-n!
所以原式=2!-1!+3!-2!+……+2009!-2008!
=2009!-1
换底公式
loga(b)=lgb/lga=lnb/lna
154=2×7×11
所以分别是2,7,11
√a²=|a|
所以原式=|0.388|+|0.603|
=0.388+0.603
=0.991
6,若点A(x1,1),B(x2,2),C(x3,-3)在双曲线上,则( ) A,x1>x2>x3 B,x1>x3>x2 C,x3>x2>x1
1x1!+2x2!+3x3!+.2008x2008!=
解方程组 X1-X2-4X3=-1 X2+X3=2 X1+X2-2X3=3线性代数
用初等行变换来解下列线性方程组(1)2x1-x2+3x3=3 3x1+x2-5x3=0 4x1-x2+x3=3 x1+3x2-13x3=-6(2) x1-2x2+x3+x4=1 x1-2x2+x3-x4=-1 x1-2x2+x3-5x4=5(3) x1-x2+x3-x4=1 x1-x2-x3+x4=0 x1-x2-2x3+2x4=-1/2
试用克拉默法则求下列线性方程组的解 x1+x3=1;2x1+2x2+3x3=3;x2+x3=-1x1+x3=12x1+2x2+3x3=3x2+x3=-1
若点(x1,1),(x2,2),(x3,-3)都是反比例函数y=-1/x图象上的点,则( ) A.x1>x2>x3 B.x1>x3>x2C.x3>x2>x1 D.x3>x1>x2
{2X1-X2+3X3=33X1+X2-5X3=04X1-X2+X3=3X1+3X2-13X3=-6{X1-2X2+3X3-4X4=4X2-X3+X4=-3X1+3X2-3X4=1-7X2+3X3+X4=-3
解方程组X1-2x2+3x3-x4=1,3x1-x2+5x3-3x4=2,2x1+x2+2x3-2x4=3
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利用逆矩阵解方程x1-x2+x3=1,-2x1-x2-2x3=3,4x1+3x2+3x3=-1
讨论线性方程组﹛X1-2x2+x3=2,3x1+2x2-x3=1,x1+x2+x3=1解的情况,求救
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求非齐次线方程组的通解 :2x1+x2-x3+x4=1 x1+2x2+x3-x4=2 x1+x2+2x3+x4=3
具体写出方程组:2x1+x2-x3+x4=1;x1+2x2+x3-x4=2;x1+x2+2x3+x4=3的通解
线性方程组 X1+X2+X3+X4=0,2X1+X2+X3+2X4=0,3X1+2X2+4X3+4=1
X1,X2,X3的平均数为1,且X1∶X2∶X3=1∶2∶3,求X1,X2,X3的方差
已知数据X1,X2,X3平均数为1,且x1:x2:x3=1:2:3,求x1,x2,x3的方差
x1+5x2-x3-x4=-1x1-2x2+x3+3x4=33x1+8x2-x3+x4=1