Help solve the math problems of the first year of junior high school, hurry!

1.Solution: Let A and B be X kilometers apart. (Note: * is a multiplier sign, a division sign, and a fraction line.) ）

From the meaning of the title. (x-36)#(10-8)=(x+36)#1/2x-18=1/4x+9

1/4x=27

x=108Answer: ......

2.Solution: Teacher Shewang brought x students.

From the meaning of the title. 40x+40=45x

5x=40x=8

A: ......3.Equations are not used.

Formula: Team B's work efficiency is. 1/20#

Team A's work efficiency is: 1/60*2=1/30

Team A fees are: 1000 * (1 1 30) = 30000 (yuan) The cost of team B is. 550 * (1 1 60) = 33,000 (yuan) 30,000 yuan < 33,000 yuan.

A: ......

1 Solution: Let the average speed of Xiao Ming and Xiao Li be x kilometers.

2x+2x+36=4x+4x—36

4x+36=8x-36

4x-8x=-36-36

4x=-72

x = 1818x4 + 36 = 108 km.

2 Solution: Set up x number of students.

40x+40=45x

40=5xx=8

3 <550*2 so use a.

1.These are two consecutive three rational numbers, and the sum is 2*23=46, so a=8, -12+h+a=23, h=27, and t can be obtained as 83The law is 8, -12, 27, 8, -12, 27, 8, -12, 27 ,...8,-12,27

2010 is a multiple of three, so it should be 27 (27 is a multiple of 27).

Solution: Since the sum of the rational numbers in any three consecutive squares is 23, there is:

t+(-12)+h=23...1)-12+h+a=23...2)a+n+k=23...

3)n+k+8=23...4) From (1) and (2) can be deduced t=a

Posts (3) and (4) can be pushed out a=23

Substitution by equal amount, so t=a=23

I shouldn't need to continue to analyze it in the future, this little classmate should be able to figure it out!

t=。a=。k=27。

Children, count the rest. -

Let the speed on the ordinary highway be x, then the speed on the highway is (x+45), and the equation of the time off series is obtained:

600 x=2[480 (x+45)] x=75, so the time required to get from A to B by highway is 480 (75+45)=4h, good luck learning progress!

The average speed set at x km h on a normal highway is 45 x km h on a motorway

600/x /2 = 480/(45＋x)x= 75

The time required for the bus to travel from A to B by highway is 480 (75+45)=4 hours.

4 hours, set the speed of the ordinary highway is x, establish a system of equations equal to the speed, you can calculate the speed of the ordinary road, you can know the speed of the highway, you can know the time.

Solution: Set a computer X yuan, B Y yuan, C Z yuan.

From the meaning of the title: open base x+y=50 x+z=50 y+x=501500x+2100y=90000 1500x+2500z=90000 2100y+2500z=90000

There are 3 ways to regret early, just solve x y z.