(x4+x5+x6)-(x3+x2=x1)/9T^2怎么来的要详细的推导公式!

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 有整数x1,x2,x3,x4,x5,x6,x7.x1 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=? 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 写一个方法,将arraylist1={{x1,x2,x3},{x4,x5,x6}}改为arraylist2={{x6,x5,X4},{x3,x2,x1}} 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=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 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, 设X1,X2X,X3,X4,X5,X6,X7为自然数,相加得2010,求X1+X2+X3=?且X1+X2=X3.X2+X3=X4 X3+X4=X5 X4+X5=X6 X5+X6=X71小时内 X1 用matlab线性编程 min=8*x1+10*x2+7*x3+6*x4+11*x5+9*x612*x1+9*x2+25*x3+20*x4+17*x5+13*x6>=60;35*x1+42*x2+18*x3+31*x4+56*x5+49*x6>=150;37*x1+53*x2+28*x3+24*x4+29*x5+20*x6>=125;其中x>0,x 请问大神知道下面这个方程怎么解吗?手工解决,要求满足方程条件,给出最优解minZ= X1+X2+ X3+ X4+ X5+ X6+ X7S.T: X1+ X3+ X4+ X5+ X6+X7≥46 X1+ X2+ X4+ X5+X6+ X7≥48 X1+ X2+ X3+ X5+X6+ X7≥52 X1+ X 怎样用lingo编程解这个方程组X1+X6>=60,X2+X1>=70,X3+X2>=60,X4+X3>=50,X5+X4>=20,X6+X5>=30求MinX=X1+X2+X3+X4+X5+X6,其中X1---X6全为正整数,包含零. 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 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=2010求x1+x2+x3的最大值 (x1,x2,x3,x4,x5,x6)来自正态总体N(0,1),Y=(x1+x2+x3)^2+(x4)^2+(x5)^2+(x6)^2; CY服从卡方分布,求C的值 lingo错误,model:max=0.487*（x1+y1)+0.53*（x2+y2)+0.613*(x3+y3)+0.72*(x4+y4)+0.487*(x5+y5)+0.52*(x6+y6)+0.64*(x7+y7);0.487*x1+0.53*x2+0.613*x3+0.72*x4+0.487*x5+0.52*x6+0.64*x7