7/10x3/8x5/14 7/13+7/13x25这两道题怎样简便就怎样算

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 7/10x3/8x5/14 7/13+7/13x25这两道题怎样简便就怎样算 求方程组x1+3x2+x3+2x4+4x5=3 2x1-x2+8x3+7x4+2x5=9 4x1+5x2+6x3+11x4+10x5=15的全部解线性代数 解方程组:x1+x2+x3+x4+x5=7 3x1+2x2+x3+x4-3x5=－2 x2+2x3+2x4+6x5=23 5x1+4x2-3x3+3x4-x5=10 3/7X5/13-(9/14-3/14)X(-11/13)-3/7X3/13 3/7x5/13-(9/14-3/14)x(-11/13)-3/7x3/13 matlab线性方程组计算X1+X2-5X3-X4+X5=98X1+5X2-X3+4X5=23X1-7X2-5X3-X4+X5=42X1+X2+8X3+3X4-X5=-86X2+2X3+7X4-2X5=15 简便计算 1.5x5/8+7x5/8=?2.3/4x5/7-3/4x1/7=?3.7/8x3/17x5/7=?4.11/19x2/7x5/11没分给对不起啊、、 LP模型：max 50x1 +80x2 +30x3 +40x4 +15x5s.t.500x1 +1000x2 +100x3 +300x4 +80x5 ≤20 000x1 + x2 ≥8x3 + x4 ≥15500x1+ 1000x2 ≤12 000x1 ≤16,x2≤10,x3≤24,x4≤4,x5≤25,x1,x2,…,x5 ≥0.max z=50x1 +80x2 +70x3,s.t.12x1 +7x2 +8x3 ≤ 80002x1 X1 - X3 - X4 -5X5=0 X1+2X2+3X3+3X4+7X5=0 X1+X2+X3+X4+X5=0 X2+2X3+2X4+6X5=0 一道数学题：3/7x5/13-（9/14-3/14）x（-11/13）-3/7x3/13 1x2+2x3+3x4+4x5+5x6+6x7+7x8+8x9+9x10+10x11 化简：(1x3)分之一+(2x4)分之一+(3x5)分之一+...+(7x9)分之一+(8x10)分之一 7分之5x5分之3X3分之10等于多少请用六年级方法谢谢 求非齐次线性方程组通解X1+X2+X3+3X4+X5=7 3X1+X2+2X3+X4-3X5=-2 2X2+X3+2X4+6X5=23 8X1+3X2+4X3+3X4-X5=12 7/8x3/17x5/7和11/19x2/7x5/11请问这2题怎么用简便算法! 解方程.7x-9=5x5(x-8)=3x 7x-5x5=2x7X12-10x=18x3(6x-7)=15x+12 求解奇次线性方程组{上面2x1+x2+3x3+5x4-5x5 =0 中x1+x2+x3+4x4-3x5=0 下面3x1+x2+5x3+6x4-7x5=0