Solution ratio: 5 / 8:3 / 4 = x: 7 / 15

Solution ratio: 5 / 8:3 / 4 = x: 7 / 15

x: 7 / 15 = 5 / 8: 3 / 4
x: Seven out of fifteen; seven out of fifteen = five out of eight; four out of three: seven out of fifteen
X = 7 / 18

The value of the unknown which can make the left and right sides of the equation equal is called ()
A. Equation B. equation C. solution equation D. solution of equation

The value of the unknown which can make the left and right sides of the equation equal is called the solution of the equation

Let's set up the unknowns and list the equation (without solving): (1) we know that there are four Sundays in a certain month, and the sum of these four days is 58
What are the dates of the first Sunday?

Let the number of days of the first Sunday be X
x+x+7+x+14+x+21=58
That is: 4x + 42 = 58
4x=16
x=4
That is: the date of the first Sunday is the 4th of this month

How to solve an equation with Two Unknowns at one end

4x-20% x = 2
(4 / 3-1 / 5) x = 2
17x of 15 = 2
X = 2 △ 17 / 15
X = 30 / 17

Known number 1 / unknown number = 0.166667 what formula can be used to calculate the unknown number
1 / unknown = 0.166667. It's better to list the calculation formula

Use the formula
Divisor = divisor / quotient
=1/0.166667
=6
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We define a new operation: a △ B = a + B / a △ B, if the unknown x △ (5 △ 1) = 6, then the unknown x=_____

a △b=a+b/a÷b
∴ 5 △1=（5+1）/(5÷1）=6/5
∴ x △（5 △1）=6
That is, X △ 6 / 5 = 6
That is, (x + 6 / 5) / (x △ 6 / 5)) = 6
∴ (x+6/5)*(6/5)/x=6
∴ x+6/5=5x
∴ 4x=6/5
∴ x=3/10

The solution of the equation x is the unknown X-1 / 6 + 1 / 3 = 1 / 5

X-1/6+1/3=1/5
x-1/6+2/6=1/5
x+1/6=1/5
30x+5=6
30x=1
x=1/30

Fill in a suitable tree in () so that the solution of the equation is x = 4.6x - () is 5.8（
Fill in a suitable tree in () so that the solution of the equation is x equal to 4. 6x - () equal to 5. 8 () plus 10x equal to 77 x plus () x equal to 30 () x plus 1 / 6x equal to 60

6X - (18.2) equals 5.8
(37) plus 10x is 77
X plus (6.5) x equals 30
(14 and 5 / 6) x plus 1 / 6x equals 60

What is a root of the equation x ^ 2 + 6x + 13 = 0?

x^2+6x+13=0
x^2+6x+9=-4
(x+3)²=-4
x+3=±2i
X = - 3 + 2I or x = - 3-2i
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It is known that m and N are the two real roots of the equation x ^ 2-6x + 5 = 0
And M

x^2-6x+5=(x-5)(x-1)=0
m. N is the two real roots of the equation x ^ 2-6x + 5 = 0, and M