X/2+3+ 1=X
X=8
Suppose you have money left after the first consumption.
Y/2+2+8=Y
Y=20
Let's start by saying that this person has Z yuan.
Z/2+ 1+20=Z
Z=42
In fact, there is a rule-
The last remaining money is 1*2+6=8.
The second 8*2+4=20
20*2+2=42 for the first time
What do you see?
(2) A solid square is a square ~2 1 chess piece added in a row horizontally and vertically, and one chess piece must be used for * * *, so a new row has (21-1)/2+1=1/kloc.
It used to be10 *10 =100 ~ Let's make a picture if we can't figure it out ~
(3) 160/20-2=6,, seems to have nothing to do with those 20 young pioneers.
(4) Look upstairs-
Suppose my sister walked for x minutes.
45X=50(X-5)
45X=50X-250
-5X=-250
X=50
50 * 45 = 2250m
Sure enough, it's a three-level question, as long as it's set, it's no problem ~