Fill in the blanks: 1 1226

3 solution: 1 solution: there are x acres of eggplant and y acres of tomatoes.

{ x+y = 25 1700 x+ 1800y = 44000 { x = 10y = 15。

10*2400+ 15*2600=63000

② Solution: Suppose X square meters are demolished and (3x+ 1000) square meters are built.

(2000-x)+(3x+ 1000)= 2000 * 1.2

x = 1500(3x+ 1000)= 5500。

1500 * 80+5500 * 700 = 3970000 (yuan)

③ Solution: Let A do X days and B do (22-x) days.

1/25x+(22-x) 1/35+(22-x) 1/25 * 1/2 = 1

X=8 (22-x)= 14 (days).

4 solution; Suppose this year, the seventh grade will recruit X students, and the first grade will recruit Y students.

{ x+y = 500 1.2x+ 1. 15y = 1. 18 * 500

The solution is {x=300 y=200.

300* 1.2=360 (person)

200* 1. 15=230 (person)

Make sure everything is all right! ! ! "*" means "multiply"