X*[700+50*(40-X)]=36000
Organize x? -54X+720=0
∴X 1=30,X2=24
When x = 24, 700+50*(40-24)= 1500 people came to see the performance, exceeding 1300 people.
∴x2=24 should be abandoned.
Answer: You can earn 36,000 yuan when you vote in 30 yuan.
2.( 1) 1250 *( 1-20%)= 1000(m？ )
A: the demolition area of the construction team on the first day 1000m?
(2) 1000*( 1+x)？ = 1440
∴X 1=0.2, X2=-2.2 (omitted)
A: This percentage is 20%.
3。 450*( 1-X)？ =288
X 1=0.2, X2=- 1.8 (omitted)
A: The percentage of waste reduction in each treatment stage is 20%.
5. X people took part in this tour.
∵27000>25000
∴X>25
X[ 1000-20*(X-25)]=27000
Tidy up and get an X? -75X+ 1350=0
X 1=45，X2=30
When x = 45,1000-20 * (x-25) =1000-20 * (45-20) = 500 < 700 (omitted).
A: There are 30 people taking part in this tour.
Where is the fourth question?