Given that x is an integer and the square of X + 2 / 3 + 3-2 / x + X - 2x / 9 + 18 Bit integer, find the sum of all the values of X that meet the conditions

Given that x is an integer and the square of X + 2 / 3 + 3-2 / x + X - 2x / 9 + 18 Bit integer, find the sum of all the values of X that meet the conditions

2/(x+3)+2/(3-x)+(2x+18)/(x^2-9)
=2/(x+3)-2/(x-3)+(2x+18)/(x^2-9)
=2(x-3)/(x^2-9)-2(x+3)/(x^2-9)+(2x+18)/(x^2-9)
=(2x-6-2x-6+2x+18)/(x^2-9)
=(2x+6)/(x^2-9)
=2(x+3)/(x-3)(x+3)
=2/(x-3).

Given (x2 + Y2) (x2 + y2-6) + 9 = 0, find the value of x2 + Y2

According to the meaning of the question, change (x2 + Y2) in the original equation to Z, so the original equation changes to: z2-6z + 9 = 0, the solution is Z1 = Z2 = 3, so x2 + y2 = 3

Given that the square of x minus the square of Y equals 9, x + y = 3, find the value of X-Y

x^2-y^2=(x+y)(x-y)=3(x-y)=9
x-y=3

When the line y = 2x + 3 moves along the Y-axis and passes through the point (2, - 1), the line moves by units
.

Let y = 2x + B
X = 2, y = - 1
-1=4+b b=-5
3+(-8)=-5
The line is shifted down eight units

There are 40 boys and 30 girls. How many more boys than girls?

The number of male students who are more than female students is the number of female students. The number of male students who are more than female students is the number of female students. The number of male students who are more than female students is the number of female students. The number of male students who are less than female students is the number of female students. The number of male students who are more than female students is the number of female students

Given: a + B + C = 0, a & sup2; + B & sup2; + C & sup2; = 1, find the value of AB + BC + ca

(a+b+c)²=0²
a²+b²+c²+2ab+2bc+2ca=0
1+2(ab+bc+ca)=0
ab+bc+ca=-1/2

There were 300 boys and girls in a middle school last year. This year, the number of boys and girls increased by 1 / 25 and 1 / 20 respectively, with a total increase of 13?

Let's set up last year's boy X
1/25x+1/20(300-x)=13
0.04x+15-0.05x=13
0.05x-0.04x=15-13
0.01x=2
x=200
This year, 200 + 200x1 / 25 boys = 208
Girls 300 + 13-208 = 105

X & # 185; &# 178; y + xy = 3 is the equation of several variables and several degrees

X & # 185; &# 178; y + xy = 3 is a bivariate equation of degree thirteen

There are 48 students in class 6 (2). The number of female students is 80% of that of male students?
Solve by equation

Set the number of boys X
x+0.8*x=48
But it's not an integer. Is your problem wrong

How to calculate the square root addition in junior high school, for example √ 6 + √ 5 - √ 2 + √ 5 × 6 + √ 7 × 5
What I want is not an answer, but an explanation step by step.

If you want to keep the decimal number, you can add a step = 29.91650858 (based on the number of reserved digits). For some things that can be simplified, such as √ 18, you should first simplify the method by multiplying several factors, and then make the multiplication an integer