Grade 7 Upper Mathematics Chapter 3 Full Learning Test Paper 15

1. Multiple choice questions:

2. Fill-in-the-blank questions:

3. Solving equations: 1Solution:

3x+2x=34-9, and the solution is x=5 2Solution: 7y+6y-6=20, and x=2 3

Solution: 3x-24+2x=6, solution x=6 4Solution:

y+1 2x4-3x4=2-y 4x4, and the solution is x=4

4. Application Questions: 1Solution:

Set the open for x hours. Formula: 72x+288=90x 2

Solution: Set up the purchase of X pieces of A and 100-x pieces of B. Formula:

20-15）x+(45-35)x(100-x=700)

5. Additional questions: (1) Yuan B: 50 + Yuan (2) 50+, solve x = 1000

So it will appear when the time is 1000 minutes. (3) A: Less than 1000 minutes, option 1 can be used; Equal to 1000 minutes, program.

One or two are acceptable; For more than 1000 minutes, option 2 can be used.

40 minutes.

The minute hand travels 6 degrees per minute, and the hour hand travels every minute. [The minute hand goes around 360 degrees in 60 minutes, and the hour hand goes around every 12 hours or 30 degrees in 1 hour].

Suppose it takes x minutes from going out to coming back, then the angle of the minute hand during this time is 6 degrees * x, and the angle of the hour hand is degree * x

Since when going out, the minute hand is after the hour hand, and the angle is 110 degrees; When you go home, the minute hand is in front of the hour hand at an angle of 110 degrees. During this period, the hour hand also moved at a certain angle. So: the angle of the minute hand state = 110 degrees + 110 degrees + the angle at which the hour hand goes.

i.e.: 6x=110+110+

x=40

Solution: After n seconds, the area of BPQ is 36cm

1/2*n*2n=36

n = 6 seconds.

Solution: Let the area of pbq after x seconds be 35 square centimeters, then there is pb=x, bq=2x, according to the title, get:

12x•2x=35，x1=35

x2=-35 (negative numbers are rounded), so 35

After seconds, the area of the PBQ is 35 square centimeters

pq=pb2+bq2

x2+4x25x2

A: After 35 seconds, the area of the PBQ is 35 square centimeters, and the distance of the PQ is 57 centimeters.

Solution: Let the area of bpq after x seconds be 36cm, then 2x multiplied by x=36, 2x =36, x =18, x=root number 18, i.e. x = 3, root number 2