Ask a math problem for the first year of junior high school! Hurry

You connect BC to make an auxiliary line, and use the sum of the inner angles of the triangle = 180 degrees to solve the problem.

If the sum of the internal angles of the quadrilateral is 360 degrees, then angle A is equal to 36 degrees, angle B is equal to 72 degrees, angle C is equal to 108 degrees, and angle D is equal to 144 degrees. Then the outer angle of angle A is 180-36=144 degrees, the outer angle of angle B is 180-72=108 degrees, the outer angle of angle C is 180-108=72 degrees, and the outer angle of angle D is 180-144=36 degrees. So the angle a outer angle:

Angle B Outer Angle: Angle C Outer Angle: Angle D Outer Angle = 4:

It's been a hard fight

Team A won six games and drew four. This problem is of the same nature as the chicken and rabbit, the difference between the draw and the win is 2 points per game, assuming that team A can score a total of 30 points if they win all the games, and now they only score 22 points, a difference of 8 points, these 8 points are the difference between the win and the draw, a total of four differences, these 4 games are draws.

Set A won x games and drew y games, then;

x+y=10

3x+y=22

Simultaneous equations yield: x=6, y=4

It's a very simple question, but I don't know if you've ever learned how to solve a problem with a column equation.

Let's say that team A wins x games, then draws 10-x games, and the equation from the problem is 3*x+1*(10-x)=22, and the solution is x=6, so team A wins 6 games and draws 4 games.

1 solution: = (2005 2006) (2004 2005) (2003 2004) ...2 3) (1 2) = 1 2006 2 solution a-2b = 2 (-1 3) square + 1 3 + 1-2 * (1 9 + 2 3-1004) = 2008 3 solution x 4 solution (-2) square + 2 x = 7 2 2 x = -1 2 x = -1 4 5 solution m 3 + 1 = 1 2 + m to substitute x = 0 to find m = 3 4 6 solve the total number of m people, participate in mathematics with x people, and have y people in physical education then 2 3m+y-1 4m=m to find y=7 12m 2 3m-7 12m=4 to find m =48 (person) 7 solution 2x-3=m then 4x-6=2m and 3x-2=2m so 4x-6=3x-2 find x=4, so m=5 8 solution time x, so there is.

1. -1/2006

3. (8/3)x-10

Persona: A who only participates in math, B who only participates in both groups, and B who only participates in the C series of equations in physical education.

Seconds set x 10 + solution x = 4 years old.