要简算 2004×20022003 (115 +217 )×15×17 1/(1x2)+1/(2x3)+1/(3x4)+
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要简算
2004×20022003 (115 +217 )×15×17
1/(1x2)+1/(2x3)+1/(3x4)+……+1/(98x99)+1/(99+100)
2004×(2002/2003) (1/15 +2/17 )×15×17
1/(1x2)+1/(2x3)+1/(3x4)+……+1/(98x99)+1/(99+100)
上面错了
2004×20022003 (115 +217 )×15×17
1/(1x2)+1/(2x3)+1/(3x4)+……+1/(98x99)+1/(99+100)
2004×(2002/2003) (1/15 +2/17 )×15×17
1/(1x2)+1/(2x3)+1/(3x4)+……+1/(98x99)+1/(99+100)
上面错了
2004×2002/2003=(20032-1)/2003=2003-1/2003=2002 20022003
(1/15+2/17)×15×17=17+2×15=17+30=47
1/(1x2)+1/(2x3)+1/(3x4)+……+1/(98x99)+1/(99+100)=1-1/2+1/2-1/3+1/3-1/4+……+1/98-1/99+1+1/99-1/100=1-1/100=99/100
(1/15+2/17)×15×17=17+2×15=17+30=47
1/(1x2)+1/(2x3)+1/(3x4)+……+1/(98x99)+1/(99+100)=1-1/2+1/2-1/3+1/3-1/4+……+1/98-1/99+1+1/99-1/100=1-1/100=99/100
要简算 2004×20022003 (115 +217 )×15×17 1/(1x2)+1/(2x3)+1/(3x4)+
1+2x4-(x2+2x3)
设线性方程组(x1+2x2-2x3+2x4=2,x2-x3-x4=1 x1+x2-x3+3x4=a)
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
1分解因式:2x4-x3-13x2-15=?2.分解因式:x5+x4+x3+x2+x+1=?3分解因式:x4-4x2+6
X1+2X2-X3+X4=1
求齐次线性方程组x1+2x2+x3+x4+x5=1 2x1+4x2+3x3+x4+x5=2 -x1-2x2+x3+3x4
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
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2
1x1!+2x2!+3x3!+4x4!.nxn!
求解一个方程急 X(1次方)+X2+X3=5 X2+X3+X4=1 X3+X4+X5=-5 X4+X5+X1=-3 X5
(x1+x2+x3+...+xn-1)(x2+x3+x4+...+xn)-(x2+x3+x4+...+xn-1)(x1+