The product of multiplication of two true fractions must be () A. True fraction B. false fraction C. uncertain

The product of multiplication of two true fractions must be () A. True fraction B. false fraction C. uncertain

Because the true fraction is less than 1, the product of multiplication of two true fractions must be true fraction

The product of multiplication of two true fractions is 7 / 12 () × () = 7 / 12
（ ）×（ ）=7/12
（ ）×（ ）=7/12
（ ）×（ ）=7/12
Please follow the answer

（2/3）×（7/8）=7/12
（3/4）×（7/9）=7/12
（5/6）×（7/10）=7/12
（11/12）×（7/11）=7/12
That should be all,

The product of two true fractions must still be true______ (judge right or wrong)

The product of two true fractions must still be true fractions, for example: 12 × 34 = 38; 23 × 16 = 19, etc.; their product is still true fractions

Who can explain to me the equation of one dollar in the seventh grade volume one?

One variable is that only one is unknown, one is only proportional, not square cube or higher multiple
If an equation contains only one unknowns and the unknowns are only one power, it is a principal process of one variable
The clever way to solve the equation is to add, subtract, multiply and divide a nonzero number on both sides of the equation, and the equation still holds
Through transformation, we get that one side contains only unknowns and the other side is constant
Usually, x, y, Z are used to represent the unknown number, a, B, C are used to represent the known number
For example, ax + B = 0 (a, B is constant) by subtracting B from both sides and dividing a by both sides to get x = - B / A
For another example, ax + BX + D + e = 0, first extract the common factor of X to get (a + b) x + D + e = 0, and then calculate the same

Arrange the positive integers according to the rule shown in the figure. If the n-th row is represented by an ordered real number (n, m), the m-th number from left to right, for example, (4,3) represents a real number 9
Then the number represented by (17,2) is
1…… first row
2 3…… Second row
4 5 6…… Third row
7 8 9 10…… Fourth row
………

138
There are x numbers in row X and 17 numbers in row 17
Then there are (1 + 17) * 17 / 2 = 153 numbers from the first to the 17th
That is to say, the last number in row 17 is 163
He asked you to ask for the second in line 17
It's the 15th from the bottom
163-15=138

What is the sum of all negative integers with absolute values greater than 3 but less than 7?

All negative integers are - 4, - 5, - 6
Then their sum = - 4 + (- 5) + (- 6) = - 15
I hope my answer can help you,
In the upper right corner of my answer, click [adopt answer],

Problems of key knowledge of mathematics in volume two of grade seven
All brothers and sisters, what I want is a question

In the algebraic formula, the following statements are correct: (a) there are four monomials and two polynomials, (b) there are four monomials and three polynomials, (c) there are four monomials and two polynomials, (d) there are four polynomials and two polynomials

There are 320 ping-pong balls and 80 ping-pong balls in box a and Box B respectively. How many times does it take to take 15 out of box a and put them into Box B to make the number in the box equal?

There are 320 ping-pong balls and 80 ping-pong balls in box a and Box B respectively. How many times does it take to take 15 out of box a and put them into Box B to make the number in the box equal?

How many 60 * 60 floor tiles does a 40 square meter house need? How to calculate?

60cm = 0.6m, a tile 0.6 * 0.6 = 0.36M m2, 40 / 0.36 = 112, but you need to buy ten more. Because the length and width of your house are not necessarily the integral multiple of 0.6, you need to cut the tiles. There is a waste of corners. So you should have some surplus. You should measure the tiles with a box ruler before you buy them. If it's a good multiple of 0.6, it's great. There should also be surplus, for fear of damage

The shape of a box of playing cards is a cuboid. 20 boxes of playing cards are packed together to form a big cuboid and become a strip. Factories need to use wrapping paper to package the whole strip for sale
1. How can 20 boxes of playing cards be packed into one? How many solutions are there?
2. Measure and calculate how many kinds of wrapping paper are needed for each scheme. (the folding part of wrapping paper is ignored)
3. Which scheme is reasonable
4. According to the investigation practice, this paper analyzes why the factory chooses the common packaging methods in real life

There are more than seven