1/2=1/2x1=1-1/2 ,1/6=1/2x3=1/2-1/3,1/12=1/3x4=1/3-1/4.
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1/2=1/2x1=1-1/2 ,1/6=1/2x3=1/2-1/3,1/12=1/3x4=1/3-1/4.
从上面的式子中你发现了什么?
用找出的规律计算1/1x2+1/2x3+1/3x4+.....1/49x50
观察下面的算是找出类似的规律,
3/4+3/4x7+3/7x10+3/10x13 1/3+1/3x5+1/5x7+1/7x9+1/9x11
从上面的式子中你发现了什么?
用找出的规律计算1/1x2+1/2x3+1/3x4+.....1/49x50
观察下面的算是找出类似的规律,
3/4+3/4x7+3/7x10+3/10x13 1/3+1/3x5+1/5x7+1/7x9+1/9x11
1/1x2+1/2x3+1/3x4+.1/49x50
=1-1/2+1/2-1/3+1/3-1/4++.1/49-1/50
=1-1/50
=49/50
3/4+3/4x7+3/7x10+3/10x13
=1-1/4+1/4-1/7+1/7-1/10+1/10-1/13
=1-1/13
=12/13
1/3+1/3x5+1/5x7+1/7x9+1/9x11
=1/2×(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)
=1/2×(1-1/11)
=5/11
=1-1/2+1/2-1/3+1/3-1/4++.1/49-1/50
=1-1/50
=49/50
3/4+3/4x7+3/7x10+3/10x13
=1-1/4+1/4-1/7+1/7-1/10+1/10-1/13
=1-1/13
=12/13
1/3+1/3x5+1/5x7+1/7x9+1/9x11
=1/2×(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11)
=1/2×(1-1/11)
=5/11
求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
X1+2X2-X3+X4=1
求非齐次线性方程组:2x1-x2+4x3-3x4=-4;x1+x3-x4=-3;3x1+x2+x3=1;7x1+7x3-
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
求齐次线性方程组x1+2x2+x3+x4+x5=1 2x1+4x2+3x3+x4+x5=2 -x1-2x2+x3+3x4
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2
设线性方程组(x1+2x2-2x3+2x4=2,x2-x3-x4=1 x1+x2-x3+3x4=a)
线性方程组 线性方程组1x1+x2 -2x4=-64x1-x2-x3-x4=13x1-x2-x3 =3方程组2X1+MX
用列主元Gauss消元法解线性方程组{-x2-x3+x4=0,x1-x2+x3-3x4=1,2x1-2x2-4x3+6x
求非齐次线性方程组的通解:2x1+x2-x3-x4=1;2x1+x2+x3-x4=1;4x1+2x2+x3-2x4=2
求非齐次线性方程组通解 X1-X2+X3-X4=1 -X1+X2+X3-X4=1 2X1-2X2-X3+X4=-1 要求
矩阵求非齐次方程组 2*X1+X2-X3+X4=1 4*X1+2*X2-2*X3+X4=2 2*X1+X2-X3-X4=