The starting price is 5 yuan. The starting price is within 8 km. 0.5 yuan will be charged for an additional kilometer above 8 km and below 20 km. Another 1 yuan will be charged for an additional kilometer above 20 km. A total of 21 yuan will be paid Ask him how many kilometers he took

The starting price is 5 yuan. The starting price is within 8 km. 0.5 yuan will be charged for an additional kilometer above 8 km and below 20 km. Another 1 yuan will be charged for an additional kilometer above 20 km. A total of 21 yuan will be paid Ask him how many kilometers he took

5+(20-8)×0.5=5+6=11
21 ＞ 11, so the distance he took was more than 20 kilometers,
If you take x km, then
5+（20-8）×0.5+（X-20）×1＝21
The solution is: x = 30
A: he took 30 kilometers

The general formula of 0.8, 0.88, 0.888, 0.8888

n=8/9[1-1/(10^n)]

2.3.5.7 how to equal 24

1、 3 × 5 + 2 + 7 = 24
2、 3 × 7 + 5-2 = 24

How do two threes and two Sevens equal 24

7×(3+3÷7)=24

-How do 7 and - 7 and - 3 and 3 equal 24 or - 24
-How do 7 and - 7 and - 3 and 3 add, subtract, multiply and divide equal 24 or - 24

24
[-3+3/(-7)]*(-7)=24
-24
[(-3)/(-7)+3]*(-7)=-24

How can 7 and - 7 and 3 and - 3 be equal to 24 and - 24

7×[（-3）÷（-7）+3]=24
-7×[3÷7-（-3）]=-24

3 3 7 7 (two 3 and two 7) how to add, subtract, and divide is equal to 24?

7×(3+3÷7)=24

Add "+, -, ×, △ and ()" to make the result equal to 24.1.3,3,7,7,2.4,4,7,7,

7×(3+3÷7)=24
7×(4-4÷7)=24

How about 2,2,6,8 equal to 24?
The order is 2, 2, 6,

6*(8-2-2)

How about 2 / 12 / 7 / 12 / 24

((2+12)/7 )* 12 =( 14/7) * 12 = 2* 12 =24