2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和
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2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和2/1X3/1+3/1x4/
2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和
2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和
2/1X3/1+3/1x4/1+4/1x5/1+5/1x6/1.41/1X42/1的和
原式=(1/2-1/3)+(1/3-1/4)+(1/4-1/5)+……+(1/41-1/42)
=1/2-1/42
=21/42-1/42
=10/21
因式分解:x4+x3+2x2 +x+1
线性代数!解非其次线性方程组;【2x1+x2-x3+x4=1;4x1+2x2-2x3+x4=2;2x1+x-x3-x4=1】.
用矩阵法姐方程组:2x1-3x2 +x 3-x4 =3 3x 1+x2 +x3 +x 4=0 4x1 -x2 -x 3-x4 =7 -2x 1-x3 +x3 +x4 =-5
用克拉默法则解下列方程组 x1-2x2+3x3-4x4=4 x2-x3+x4=-3 x1+3x2+2x4=1 -7x2+3x3+x4=3x1-2x2+3x3-4x4=4x2-x3+x4=-3 x1+3x2+2x4=1 -7x2+3x3+x4=3
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x4+x3+2x²+x+1分解因式
x1-x2+x3=1x2-x3+x4=21若x1,x2,x3,x4,x5满足方程组 x3-x4+x5=3x4-x5+x1=4x5-x1+x2=5求x2 x3 x4的值2已知 x1+x4+x6+x7=39 x2+x4+x5+x7=49 x3+x5+x6+x7=41 x4+x7=13 x5+x7=14 x6+x7=9 x1+x2+x3+x4+x5+x6+x7=9求x7的值若x1,x2,x3,x4,x5满足方程组 x1-x
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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+6x4=-1,x1-2x2-4x3+x4=-1