Eight New Classroom Math Answers People s Education Experimental Edition 10

Practice. 1.Approximate points:

1）2x/(3y) ；2）-2a/(3b) ；3）1/(x-a) ；4）(x-2)/y .

2.General points:

1） 4y/(12x^2y),5x/(12x^2y)； 2）(x-1)/[x(x-1)(x+1)] x+1)/[x(x+1)(x-1)]

3.During the military training, Xiaohua's target shooting results were M 9 rings and N 7 rings, may I ask, how many rings per Xiaohua's average score?

16/(m+n)

Exercise 1Fill in the blank with fractions:

1) If Xiao Ming walks a road of s kilometers in t, the average speed of his walking on this road is s kilometers per hour;

2) When a truck delivers goods up the mountain, when the speed of the uphill is x kilometers and when the speed of the descent is y kilometers, the average speed of the truck is 2xy (x+y) kilometers per kilometer hour.

2.Pointing out which of the following rational formulas are fractions?

3.When x takes what value, the following fraction makes sense?

1) x does not = 0; 2) x does not = -2 ; 3) x does not = -1 4; 4) x does not = 5 3

4.General points:

1）c^2/(abc) 、a^2/(abc) 、b^2/(abc) ；2）(x+1)/[x(x+1)^2]，-x/[x(x+1)^2] .

5.If a machinery factory wants to produce a certain part in batches, the first process needs to forge a batch of round steel with a length of l centimeters and a bottom radius of 2r centimeters into a round track history steel with a bottom radius of r centimeters. How many centimeters is the length of the forged round bar?

1*pie(2r) 2=x*pier 2

x=4cm

You have to specify which version it is! Of course, it's better to do it yourself!

1. The square difference of the two numbers is equal to the coarse product of the sum of the two numbers and the difference between the two numbers.

2 Let the number of these two states be a, b (a-b)*(a+b)=a*a+a*b-b*a-b*b*b=a 2-b 2

The square difference of the two numbers is equal to the sum of the two Tanna slip numbers and the product of the difference between these two numbers, let these two numbers be a , b (a-b)*(a+b)=a*a+a*b-b*a-b*b=a 2-b 2