[(3/5-0.25)x4/7+0.3]÷3/4=?
2X1+X2-5X3+X4=8,X1-3X2-6X4=9,2X2-X3+2X4=-5,X1+4X2-7X3+6X4=0.
奇次线性方程组x1-2x2+3x3-4x4=0 x2-x3+x4=0 x1+3x2-kx4=0 -7x2+kx3+x4=
X1 - X3 - X4 -5X5=0 X1+2X2+3X3+3X4+7X5=0 X1+X2+X3+X4+X5=0 X2
.解线性方程组|X1+X2+X3+X4=5 |X1+2X2-X3+4X4=-2 |2X1-3X2-X3-5X4=-2 |
定义一种新运算 观察下列算式 1@3=1x4+3=7 3@1=3x4+1=13 5@4=5x4+4=24 4@3= 请你
求齐次线性方程组1-X2-X3-X4=0,2X1-3X2-4X3-4X4=0,5X1-6X2-7X3-7X4=0的基础解
9-1=2x4,16-4=3x4,25-9=4x4,36-16=5x4```这些等式反映出自然数见的某种规律,设n表示自
解线性方程组 求齐次线性方程组X1+X2+X3+X4=0,2X1+3X2+4X3+5X4=0,4X1+5X2+6X3+7
5x2=11 2x4=14 3x2=7 4x5=30 问:8x4=?请写清过程,
41又1/3x4/3+51又1/4x4/5+61又1/5x5/6=多少
那1+2÷3x4+5+6-7÷8=1
分解因式:(x4+x2-4)(x4+x2+3)+10=______.