3x+2y-z=1,2x-y+2z=5,5x-2y+3z=13
人气：239 ℃ 时间：2020-02-04 10:30:22
解答
3x+2y-z=1 ①2x-y+2z=5 ②5x-2y+3z=13 ③由③+①得：8x+2z=14 即4x+z=7 ④由①+②×2得：7x+3z=11 ⑤由④×3-⑤得：5x=10x=2把x=2代入④得：8+z=7z=-1把x=2,z=-1代入②得：4-y-2=5y=-3所以方程组的解为：x=2 y=-3 z=...
推荐
- 3x+2y+z=30,3x+y+2z=14,5x+3z=44,3x+2z=?
- （1）x+y-z=0 2x-y+3z=2 x-4y-2z+6=0(2)3x+y=6 x+2y-z=5 5x-3y+2z=4(3)x+y+z=-1 4x-2y+3z=5 y-z=8-2x
- 3x-2y+2z=3.-2x+4y+3z=-3.5x+2y-3z=-12三元一次方程组
- 2x-3y+4z=-4;3x=y-2z;5x+2y+3z=2
- 已知方程组x-2y+z=0,5x+2y-3z=0,求3x-y+2z分之4x+2y-3z的值
- 设二次方程anx²–an+1x+1=0有两个实数跟a和b,并且满足6a–2ab+6b=3.试用an表示an+1
- fill in the correct form in these sentences-has got,hasn't got,has he got,they've got,we haven't...
- 求解微分方程y''+y=cosx+1
猜你喜欢
