规律:1-1/3=1/3x2,1/3-1/5=1/3x1/5x2,1/5-1/7=1/5x1/7x2
来源:学生作业帮 编辑:拍题作业网作业帮 分类:数学作业 时间:2024/04/29 18:57:35
规律:1-1/3=1/3x2,1/3-1/5=1/3x1/5x2,1/5-1/7=1/5x1/7x2
根据以上规律解答这道题
1x3/1+3x5/1+5x7/1+7x9/1+9x11/1+11x13/1+13x15/1+15x17/1+17x19/1+19x21/1
=
=
=
困惑死了 这上面给的规律和下面这题有上面关联请告诉我吧
根据以上规律解答这道题
1x3/1+3x5/1+5x7/1+7x9/1+9x11/1+11x13/1+13x15/1+15x17/1+17x19/1+19x21/1
=
=
=
困惑死了 这上面给的规律和下面这题有上面关联请告诉我吧
1/1x3+1/3x5+1/5x7+1/7x9+1/9x11+1/11x13+1/13x15+1/15x17+1/17x19+1/19x21
=1/2x(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15+1/15-1/17+1/17-1/19+1/19-1/21)
=1/2x(1-1/21)
=1/2x20/21
=10/21
=1/2x(1-1/3+1/3-1/5+1/5-1/7+1/7-1/9+1/9-1/11+1/11-1/13+1/13-1/15+1/15-1/17+1/17-1/19+1/19-1/21)
=1/2x(1-1/21)
=1/2x20/21
=10/21
已知X1 X2为方程5X平方-3X-1=0且X1>X2求X1-X2
用图解法求线性规划?max z = x1+3x2 5x1+10x≤50 X1+X2≥1 X2≤4 X1,X2≥0
规律:1-1/3=1/3x2,1/3-1/5=1/3x1/5x2,1/5-1/7=1/5x1/7x2
已知X1*X2=1 ,X1+X2=3 ,求X1三次方+X2三次方
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求线性方程组 x2-x3-x4=0 x1+x2-x3+3x4=1 x1-x2+x3+5x4=-1 x1+2x2-2x3+
设x1和x2是一元二次方程5x²-7x-3=0的两个根,求x1²+x2²和x1分之1+x2
float x1,x2; x1=3/2; x2=x1/2; printf("%d%.1f",(int)x1,x2); 输
求解线性方程组x1+x2=5,2x1+x2+x3+2x4=1 5x1+3x2+2x3+2x4=3
求非齐次线性方程组的一个解x1+x2=5,2x1+x2+x3+2x4=1,5x1+3x2+2x3+2x4=3
若x1和x2是方程x^2+5x-3=0的两根,求值:(1) |x1-x2| (2)1\x1^2+1\x2^2
解方程组X2+X3+X4=1 X1+X2+X3=5 X3+X4+X5=-5 X4+X5+X1=-3 X5+X1+X2=2