The quotient of division of two reciprocal numbers is 4 / 81, and the sum of these two numbers is () Hurry!

85/18

If two reciprocal numbers divide each other, the quotient is the square of one of them?

That's right
For example: 1 △ 1 = 1

If AB is opposite to each other, CD is reciprocal to each other, and X is equal to 1, find a 10 B 10 x 10 CD of X

If AB is opposite to each other and CD is reciprocal to each other, X is equal to 1,
A ten B ten x ten CD
=(0+1+x)/x
=1/x+1
When x = 1, the original formula is 2;
When x = - 1, the original formula is 1-1 = 0;
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A number consists of a ten and four 1 / 7. This number is () and its reciprocal is ()

A number consists of a ten and four 1 / 7. This number is (10 and 4 / 7), and its reciprocal is (7 / 74)

Cup + Learning cup + Math cup + love math cup + I love math cup = love learning, love learning, love each word is equal to a number
Can you tell me the way.

9+29+729+5729+45729=52225
This can be analyzed first. The last bit of B.5 * e can only be 0 or 5. And B is the beginning of a number. So B can only be 5
And a is easy to get. It's 4
I have to write this kind of topic by myself. It's fun

Subtracting 1.5 times of a number from 5.6 is equal to the sum of 0.5 times of the number and 4

Let this number be X
5.6-1.5X=0.5X+4
2X=1.6
X=0.8
A: this number is 0.8
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The sum of X and 6.4 is equal to the difference between 14 and 2.5

x+6.4=14-2.5,
x+6.4=11.5,
x=11.5-6.4
=5.1.

To solve the problem (1) 2.5 times of a number is more than six tenths of it

Let this number be X
Then 2.5x-6 / 10 * x = 38
2.5x-0.6x=38
1.9x=38
x=38÷1.9
x=20
A: the number is 20

The ratio of a number to 12 is equal to the ratio of 8 to 3

Let this number be X. from the meaning of the question, we can get: X: 12 = 8:3 & nbsp; & nbsp; 3x = 12 × 8 & nbsp; & nbsp; 3x = 963x ／ 3 = 96 ／ 3 & nbsp; & nbsp; & nbsp; X = 32

A number is increased by 20% to 72. What's the number

x(1+20%)=72
1.2x=72
x=60

The quotient of division of two reciprocal numbers is 4 / 81, and the sum of these two numbers is () Hurry!