Math gurus do the math! Which math master!

6x-5y+z=-6...1

6x+y+4z=3...2

6x+3y-5z=0...3

1 + 3.

2y-4z=6

y+2z=-3...4

2 + 3.

4y-z=3...5

4 type + 5 type *2 get.

9y=3y=1/3...6

Replace 6 with 4.

y+2z=-3

1/3+2z=-3

2z=-10/3

z=-5/3...7

Replace 6 and 7 with 3.

6x+3y-5z=0

6x+3*1/3-5*(-5/3)=0

6x+1+25/3=0

6x+28/3=0

6x=28/3

3x=14/3

x=14/9

So x=14 9, y=1 3, z=-5 3

Personally, I think you're overthinking the problem.

In fact, in terms of profit, don't think about it so much.

Total: 12000

The purchase price is the ask price.

Actual number of transactions: 10000

The profit is: 10,000 * yuan.

One of the things that bothers you is nothing more than the testing part, but this one is unknown. You may not really exchange 20% of the goods for free. So, in fact, your profit is greater than 200. The profit range is between 200-800.

It should be {3800 divided by (10000 plus 2000)} and multiplied by 10000.

1.(2m+1) crypto-[3(m-2)+1]=3, brackets open, 2m+1-3m+6-1=3

Finishing -m=-3 yields m=3

Find m=32Let the side length be x on one side and yx*y=150 on the other side

2x+y=35

Find x=10 or x=, respectively, to get y=15 or y=20, because y is less than or equal to 18.

x=,y=20 is not a buried solution.

x=10，y=15

Proof: Connect AN.

d is the midpoint of am, dn am. dn is the am bisector.

AMN is an isosceles triangle with an=mn, and man= amnman= mac+ nac.

amn= b+ bam (outer corner of the triangle mab) am bisected bac, bam= mac

Broadman b= nac

anm=∠anm.∴△abn∽△can

an²=bn×cn.i.e. mn = bn cn