Two children play checkers The rules of the game are as follows: first draw a number axis, and the pieces fall on the number axis. For the first time, jump 1 unit K1 from K0 to the left, and for the second step, jump 2 units to K2 from K1 to the right. For the third part, jump 3 units to K3 from K2 to the left, and for the fourth part, jump 4 units to K4 from K3 to the right, (1) Ask the number represented by the initial position K0. (2) find the number represented by the point k211 =Please give the steps to solve the problem, no, don't quarrel there~

Two children play checkers The rules of the game are as follows: first draw a number axis, and the pieces fall on the number axis. For the first time, jump 1 unit K1 from K0 to the left, and for the second step, jump 2 units to K2 from K1 to the right. For the third part, jump 3 units to K3 from K2 to the left, and for the fourth part, jump 4 units to K4 from K3 to the right, (1) Ask the number represented by the initial position K0. (2) find the number represented by the point k211 =Please give the steps to solve the problem, no, don't quarrel there~

(1) Jump left is negative, jump right is positive;
k-1+2-3+4-5.+12=18；
k+6=18;
k=12

A class of students to play games, every 8 people in a group, every 12 people in a group are just finished. This class of students in 40 - 50 people
How many students are there in this class?
Seek formula, seek analysis

The problem is to find the common multiple of 8 and 12
8=2×2×2
12=2×2×3
Least common multiple = 2 × 2 × 2 × 3 = 24
Because the number is between 40 and 50
So:
Number of people = 24 × 2 = 48
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As shown in the figure, a, O, B are in a straight line, OE bisects ∠ cob, OD ⊥ OE in O, try to explain od bisects ∠ AOC

∵ 1 + ∠ 4 = 180 ° - DOE = 90 ° and ∵ OD ⊥ OE, ∵ 2 + ∠ 3 = 90 ゜, ∵ OE bisects ∠ cob, i.e. ∵ 1 = 2, ∵ 3 = 4 (the remaining angles of equal angles are equal). ∵ od bisects ∠ AOC

A four digit number has the same first two digits and the same last two digits. It is a complete square number. What is this number?

This number is 7744 = 11 & # 178; × 8 & # 178; = 88 & # 178;