Is LNX LNY equal to ln (x / y)

Is LNX LNY equal to ln (x / y)

LNX LNY equals ln (x / y) LNX + LNY equals ln (x * y)

If LNX LNY = a, then ln (x / 2) ^ 3-ln (Y / 2) ^ 3 is equal to?

ln（x/2）^3－ln（y/2）^3=3ln（x/2）－3ln（y/2）=3ln[(x/2)/(y/2)]=3ln(x/y)=3(lnx-lny)=3a

How much LNX is ln (x / 2) in senior one

=lnx-ln2

There are 30 male workers and 50 female workers in the toy workshop. How many male workers are there? How many female workers are there?

30 out of 50 (approximately) 50 out of 80 (approximately)

Factorization of x ^ 2 + X + 1 / x ^ 2 + 1 / x-4
1 / x ^ 2 and 1 / X in parentheses

The above formula is equal to X * x + 2 + 1 / X * x + X + 1 / X-6 = (x + 1 / x) * (x + 1 / x) + X + 1 / X-6 = (x + 1 / X-2) * (x + 1 / x + 3)

Boys account for 6 / 5 of girls in the chorus, and then three girls are added. At this time, boys account for 12 / 5 of the total number of chorus. How many men and women are there
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Boys are 5 / 6 (5 / 6) of girls
So the ratio of male to female is 5 / 6:1 = 5:6
So boys make up 5 / 11 of the total
After adding 3 girls, boys account for 5 / 12 of the total, and the total number = (5 / 11) / (5 / 12) = 12 / 11
So the original number of people = 3 / (12 / 11-1) = 3 / (1 / 11) = 33
There are 33 × 5 / 11 boys = 15
There are 33-15 girls = 18

(x2 + 3x + 3) (x2 + 3x-7) + 25 factorization

Consider x ^ 2 + 3x as a
(a+3）（a-7)+25
=a^2-4a+4
=(a-2)^2
=(x^2+3x-a)^2

There are 325 boys and girls in a grade. In the new school year, there are 25 boys and 5 girls, and the total number is increased by 16
A. 160B. 170C. 180D. 190

325 - (25-16) △ 5% + 25 = 325-9 △ 5% + 25, = 325-180 + 25, = 170 (people). A: now there are 170 boys

What is 1 / 3y-1 / 5x + 2 / 3y-4 / 5x? Algebraic expression

y-x

The number a is 150, the number B is 15% more than the number a, the number C is 20% less than the number B, and the number C is ()
After the circle was expanded, its area was eight times more than the original, and its circumference was 50.24 cm more than the original. The circle was () square centimeter

The number a is 150, the number B is 15% more than the number a, the number C is 20% less than the number B, the number C is (138) 150 × (1 + 15%) × (1-20%) = 150 × 1.15 × 0.8 = 138 circle, after expansion, the area is 8 times more than the original, the perimeter is 50.24 cm more than the original, the circle is (50.24) square meters, the area is 1 +