Urgent, due tomorrow! (2 19:4:58) Is it possible that the x 1, x 2, x 3 given to you are not the roots of the original equation?

Urgent, due tomorrow! (2 19:4:58) Is it possible that the x 1, x 2, x 3 given to you are not the roots of the original equation?

The fractional equation is possible, but it has at most two roots. When the denominator is 0, it is not the root of the original equation

In a chess game, each player has just one game with the other players. The winner of each game gets 2 points, and the loser gets 0 points. If the game is tied, each player gets 1 point. Now the total score of all players in the game is 1980 points. How many players will participate in this game?

Suppose there are x contestants in the competition. According to the meaning of the title, we can know that there are x (x − 1) 2 games, then x (x-1) = 1980, and the solution is X1 = 45, X2 = - 44 (rounding off). There are 45 contestants in the competition. A: there are 45 contestants in this competition

(1)33°14′5″+27°19′58″=?（2）32°16′4″÷4=?

1、=60°33′63″=60°34′3″
2、=8°4′1″

3x + (58-x) × 2 = 134, how can this equation be solved

Step 1: remove brackets: 3x + 116-2x = 134
Step 2: sorting: x + 116 = 134
Step 3: subtract 116: x = 18 from both sides
That's the solution

Lie equation: X is 19, 2 less than 4 times of it, find X

4x-x=19.2
3x=19.2
x=19.2÷3
x=6.4

1+58×25

1451

58.1 contains () thousandths

58100

3 and 12:1-7:1-7:5 + 2 and 12:5

3 and 12:1-7:1-7:5 + 2 and 12:5
=(3 1 / 12 + 2 5 / 12) - (1 / 7 + 5 / 7)
=5 and 1 / 2-6 / 7
=5:7-14:12
=Four and nine fourths

How to calculate! | 1 / 2012-1 / 2011 - | 1 / 2013-1 / 2011 + | 1 / 2013-1 / 2012|

|1\2012-1\2011|-|1\2013-1\2011|+|1\2013-1\2012|
=1/2011-1/2012-(1/2011-1/2013)+1/2012-1/2013
=1/2011-1/2012-1/2011+1/2013+1/2012-1/2013
=0

Can 12.78 - (1.78-1.24) + 6.76 be simplified?

12.78-(1.78-1.24)+6.76
=12.78-1.78+1.24+6.76
=(12.78-1.78)+(1.24+6.76)
=11 + 8
=19