1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
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1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x111x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x111x2+2x3+3x4+4x5+
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
=10×(10+1)×(10+2)÷3
=10×11×12÷3
=110×12÷3
=1320÷3
=440
n=10 ,很好算得,得440。也许我的方法很麻烦,但是思路是很不错的,可以1x2 2x3 3x4 4x5 5x6 6x7 7x8 8x9 9x10 10x11 =2 6 12 20
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
1x2+2x3+3x4+4x5+5x6---+99x100=?
1x2+2x3+3x4+4x5+5x6+.+99x100
巧算:1x2+2x3+3x4+4x5+5x6+6x7...+8x9
1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+......1/2008x2009
1/1x2+2/1x3+3/1x4+4/1x5+5/1x6+6/1x7=
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11
(2X2)/1X3+(4X4)/(3X5)+(6X6)/(5X7)+...+(20X20)/(19X21)==?
1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9=
1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101简便算法答案
2013/1x2+2013/2X3+2013/3X4+2013/4X5+2013/5X6简便计算,
帮我用lingo或者lindo算个题呗?x1+x4+x5+x6+x7>20x1+x2+x5+x6+x7>13x1+x2+x3+x6+x7>10x1+x2+x3+x4+x7>12x1+x2+x3+x4+x5+>16x2+x3+x4+x5+x6+>18x3+x4+x5+x6+x7>20格式不对也改下哈,>在lingo中应该和>=一样吧?min=(5x1+4x2+3x3+3x4+3x5+3x6+4x7)
x1-x2+x3=1 x2-x3+x4=2 x3-x4+x5=3 x4-x5+x1=4 x5-x1+x2=5 求x1,x2,x3,x4,x5
求非齐次线性方程组的通解x1+3x2+5x3-4x4=1x1+3x2+2x3-2x4+x5=-1x1-2x2+x3-x4-x5=3x1+2x2+x3-x4-x5=3
求编程高手.求x1+2*x2+3*x3+4*x4+5*x5+9*x6的最小值其中x1+x2+x3
解一道方程组x1+x2+x3=5,x2+x3+x4=1,x3+x4+x5=-5,x4+x5+x1=-3,x5+x1+x2=2
若x1,x2,x3,x4,x5满足方程组:x1-x2+x3=1 x2-x3+x4=2 x3-x4+x5=3 x4-x5+x1=4 x5-x1+x2=5 求x2,x3,x4的少打了个字,是求x2,x3,x4的值
计算:1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9+1/9x10.