The sum of one half of X and the reciprocal of y is .

1) Grandpa is y years old this year, obviously 51 years younger than grandpa, and Mingming's age is (y-51) years old.

2) The sum of the reciprocal of a number y and three-quarters is (y + four-thirds).

3) One-third of a plus three times of b is (a 3+3b).

4) The sum of the products of x, y, and z and the average of these three numbers is (xyz+(x+y+z) 3).

5) The multiple of the number A is equal to 80% of the number of B, and the number A is known to be 100, find the number of B.

The number B is 100*

5) Two-thirds of a number plus equals 24, find this number.

Let this number be x

2x/3+2x/3=

x=6)two-thirds of 45 equals 60% of a number, find this number.

Let this number be x

45*2/3=60%x

x=507) The output of a factory in August was A, and the output in September was 17% lower than that in August. Rule.

What is the total production in August and September?

September production is 17% lower than August's, then September production is (

The output in August and September was altogether.

8) There are two kinds of fountain pens in the store, the unit price is A and B, the unit price A is 6 sticks, and the unit price B buys 10 pens, so how much does it cost to buy two kinds of fountain pens?

6a+10b

9) Draw the largest square in a garden with a circumference of centimeters. What is the square area of this square in centimeters?

A garden with a circumference of centimeters, 2 r= r=

Then the diagonal of the largest square should be 6 cm in diameter for the garden.

So the area of the square is 1 2*6*6=18 square centimeters.

1) y-51

2) y+3/4

3) a/3+3b

4) abc+(a+b+c)/3

7)8) 6a+10b

This is a ** question, so strange?

Half of a y is half of y (y 2), and its reciprocal is 2 y.

Summary. x 10 divided by 2 y

x 10 divided by 2 y

x 10 times y 2

What do you mean. xy/20

Because xy is the reciprocal multiplication is.

Multiplication is 1, so the result is 1 20

Thanks a lot. You're welcome, please give a thumbs up.

The result is 1 because x,y is the number of inverted chambers, x = 1 y1 (x+y) (1 x +1 y) = 1 (x+y) x+y) xy

1 Destroy Sun XY

Because x = 1 y

So 1 xy = 1

x+y=1/2

y=1/2-x

xy=-1/2

x(1/2-x)=-1/2

x^2+x/2=-1/2

2x^2-x=1

2x^2-x-1=0

2x+1)(x-1)=0

x=-1 ft is missing 2 or x=1

When x=-1 2.

y=1/2-x=1/2-(-1/2)=1

When x=1, the age is difficult.

y=1/2-1=-1/2

From x and the object posture laughing book pin y mutual cover contains the reciprocal, get.

xy=1 is obtained by 4 x=y a.

xy=4a=1

The solution yields a=1 4

The following describes how to find y=x and y=x. The curve y=1 x and y=x are in the first place.

First, the third quadrant has an intersection point, and the intersection point of the banquet is a(1,1),d(-1,-1), and because y=2, it can only be enclosed in the first remaining quadrant, and the intersection point is b(1 2,2),c(2,2), from point A to the x-axis as a perpendicular line to the auspicious roll E, from point B to the x-axis as a perpendicular line to G, from point C to the X-axis as a perpendicular line to F.

Yes, all. In general, the relationship between two variables x and y can be expressed as a function of the form y=kx (k is a constant and k≠0), then y is called a proportional function of x.

A proportional function is a one-time function, but a one-time function must be proportional. A proportional function is a special form of a primary function, i.e., a primary function.

y=kx+b

, if b 0, the so-called "intercept on the y-axis", is zero, then it is a proportional function. The relationship of the proportional function is expressed as: y=kx (soqin k is the proportionality factor).

When k is 0 (one or three quadrants), the larger the k, the closer the image is to the y-axis. The value of the function y increases as the independent variable x increases

When k is 0 (quadrant 24), the smaller the k, the closer the image is to the y-axis. As the value of the independent variable x increases, the value of y decreases gradually