(1) According to the meaning of fraction, 2 / 3 times 1 / 4 is equal to 1 / 6. It is rewritten into two division expressions, which are () and () (2) 9 parts equals 3:20 equals 18 divided by () equals 100 parts equals () (decimal) (3) The weight ratio of the transported goods to the remaining goods is (): (), and the weight ratio of the transported goods to the total goods is (): () (4) In 7:12, add 7 to the preceding term of the ratio. To keep the ratio unchanged, the following term of the ratio should be () (5) A kind of liquid medicine, which is mixed with water in the mass ratio of 1:8. In the 18 kg liquid medicine, how many parts of the mass of the medicine and how many parts of the mass of the water account for (6) The volume of water after ice formation is 11 / 10 of the original water, and the volume of water after ice melting is () cubic meters

(1 / 6) / (1 / 4) = 2 / 3, (1 / 6) / (2 / 3) = 1 / 40.1528:49,28:77 plus 121 / 9,8 / 91 / 2 △ 11 / 10 = 5 / 11

1 in 6 times 3 in 5 = 1 in 10

1 in 10 divided by 3 in 5 = 1 in 10 multiplied by 5 in 3 = 1 in 6
1 in 10 divided by 1 in 6 = 1 in 10 multiplied by 6 = 3 in 5

Given that real numbers x and y satisfy x 2 + y 2 = 1, the value range of Y + 2x + 1 is obtained

Let k = y − (− 2) x − (− 1), then K can be regarded as the slope of the line from the moving point P on the circle x2 + y2 = 1 to the fixed point a (- 1, - 2) and the slope when it is tangent. Since the line is tangent to the circle at this time, let the equation of the line be y + 2 = K (x + 1), and change it into a straight line, the general formula is kx-y + K-2 = 0

There are 430 students in grade 4, 5 and 6 of Yucai primary school. The ratio of grade 5 to grade 4 is known to be 5:4. The number of students in Grade 6 is 16 / 15 of that in Grade 5. How many more students are in Grade 6 than in grade 4? Please use primary school knowledge to solve problems. Thank you

There are 12x in grade 4, 15x in Grade 5 and 16x in Grade 6
So 12x + 15x + 16x = 430
43X=430
X=10
So there are 16x-12x = 4x = 4 * 10 = 40 more students in Grade 6 than in grade 4

What is the square root of 3.14

Positive and negative root sign 3.14, two

Given that the sum of a and B is 2, the sum of a and B is 5, the sum of B and C is 3, what is the sum of a, B and C
If the sum of the two numbers of a and B is 2, the sum of the two numbers of a and B is 5, the sum of the two numbers of B and C is 3, what is the sum of the three numbers of a, B and C

A B + B C + a C = 2 a B C
SO 2 + 5 + 3 = 10
10/2=5

What is the definition of factorization

The transformation of a polynomial into the product of several integers is called factorization of the polynomial

The number a is 24, the greatest common factor of a and B is 6, the least common multiple is 120, and the number B is ()

The number a is 24, the greatest common factor of a and B is 6, the least common multiple is 120, and the number B is (30)
120×6÷24=30

If the negative 1 power of (a + 1) is less than the negative 1 power of (3-2a), find the value range of real number a,

If the negative 1 power of (a + 1) is less than the negative 1 power of (3-2a), find the value range of real number a
The - 1 power of y = x is a decreasing function
So a + 1 > 3-2a is satisfied
3a > 2
A > 2 / 3
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Two ninths of the number a and three eighths of the number B are equal
Two ninths of number a and three eighths of number B are equal (both numbers a and B are not zero). What is the simplest integer ratio of number a and number B?

It should be 16-27