Dear Achievers! How to solve the ninth question? Ask for help, there is a calculation process.

The first method: set A x per hour, A and B 36 in 2 hours, B is 18-x per hour, A C is 48 per hour, C is 32-x per hour, and 96 per hour from B and C in 4 hours, 4 * (18-x + 32-x) = 96, x = 13, B is 5, C is 19, and the three people have a total of 37 per hour.

The second method: the faster method, from A and B 2 hours to 36, can A and B 1 hour to 18; In the same way, B and C are 24 for 1 hour, and A and C are 32 for 1 hour, and the sum of the three is that A B + B C + A C = 2 (A + B + C) = 74, then A B and C 1 hour 37

The lower three methods, let A be x B is y C is z to obtain a system of 3 yuan 1st order equations.

2（x+y)=36

4(y+z)=96

The solution is x=13

y=5z=19

x+y+z=37

Direct Column Equations: Set up the number of pieces that A, B, and C work per hour as x y z, and have the title to list the equations:

2(x+y)=36 4(y+z)=96 Solve the system of equations, solve: x=13, y=5, z=19

Let A, B, and C produce x, y, and z per hour, respectively, then there is a system of equations:

x+y=36/2=18

y+z=96/4=24

x+z=48/

The sum of the three equations is: 2x+2y+2z=18+24+32=74, so x+y+z=37

A + B = 18 hours.

B + C = 24 hours.

A + C = 32 hours.

All add up: 2 * (A + B + C) = 74 hours.

So A, B, C = 37 hours.

A and B have 18 in 1 hour, B and C have 24 in 1 hour, and A and C produce 32 in 1 hour (** should be 48).

AB + B C + A-C) 2=37

Let A which is high, B, and C respectively produce x, y, and z when each small Li Yuan, then there is a system of equations:

x+y=36/2=18

y+z=96/4=24

x+z=48/

The sum of the three equations is: 2x+2y+2z=18+24+32=74, so x+y+z=37

A + B = 18 hours.

B + C = 24 hours.

A + C = 32 hours.

All add up to the imitation paragraph: 2 * (A + B + C) = 74 hours.

Therefore, A is honored with B C = 37 hours.

A and B 18 empty skins in 1 hour, B C 1 small bucket Pei 24 times, A C 1 hour production of 32 (** should be 48 in width).

AB + B C + A-C) 2=37

Let the side length of the original iron sheet be x according to the meaning of the inscription (x-4 times 2) squared times 4=