X1+X2+X3+X4+X5+X6+X7=2010,X1+X2=X3,X2+X3=X4,X3+X4=X5,X4+X5=X6,X5+X6=X7求X3最大值

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X1+X2+X3+X4+X5+X6+X7=2010,X1+X2=X3,X2+X3=X4,X3+X4=X5,X4+X5=X6,X5+X6=X7求X3最大值 有整数x1,x2,x3,x4,x5,x6,x7.x1 求用matlab解方程组已知:X1+X2+X3=0.030852 0.5X1+X2+0.5X5-0.21na =0.012578 2X3+X4+X5 =0.029356 X7-0.79na =0 36.5 X2 X4= 27.156 X5 X1 12876+33723.33na=324938.80X1+68925.48 X2 + 965091.69 X3 + 323197.81 X4+ 53916.70X5 + 41341. 一道用matlab求解的线性规划问题z=x1+x2+x3+x4+x5+x6+x7x1+x4+x5+x6+x7>=50x1+x2+x3+x6+x7>=50x1+x2+x3+x4+x7>=50x1+x2+x3+x4+x5>=80x2+x3+x4+x5+x6>=90x3+x4+x5+x6+x7>=90 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) 一道数学题,很难啊x1,x2,x3,x4,x5,x6,x7是七个有理数,且x1小于x2小于x3小于x4小于x5小于x6小于x7.x1加x2加等于x3.x2加x3等于x4… … …x5加x6等于x7.问x1+x2+x3=?还有一个就是x1+x2+x3+x4+x5+x6+x7=2021 已知x1+x2+x3+x4+x5+x6+x7=2010,且x1+x2=x3,x2+x3=x4,x3+x4=x5,x5+x6=x7,问x1+x2+x3=? 求不定方程X1+X2+X3+3X4+3X5+5X6=21的正整数解的组数 已知有一列数x1,x2,x3,...,x7,且x1=8,x7=5832,x1/x2=x2/x3=x3/x4=x4/x5=x5/x6=x6/x7=x7/x8,求x5的值, 1x1-2x2+3x3-4x4+5x5-6x6.-100x100+101x101 设x1~x7是自然数,且x1<x2<...<x7,x1+x2=x3,x2+x3=x4,x3+x4=x5,x4+x5=x6,x5+x6=x7又x1+.x7=201求x1+x2+x3的最大值又x1+x2+x3+x4+x5+x6+x7=2010 x1,x2,x3,x4,x5,x6,x7为自然数,并且x1 设x1,x2,x3,x4,x5,x6,x7是自然数,且x1 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 求解最佳方案X1 X2 X3 X4 X5 X6 X7 X8 X9 X10 X11 X12 1/1x2+1/2x3+1/3x4+1/4x5+1/5x6+1/6x7+1/7x8+1/8x9=?急! 为什么1/2+5/6+11/12+19/20+…………+89/90 的规律是1X2.2X3.3X4.4X5.5X6.6X7. x8+x7+x6 +x5+x4+x3+x2+x+1因式分解