Xiaodong bought 5 story books and 4 Novels for a total of 52.6 yuan, while Xiaomei bought 4 story books and 5 novels for a total of 51.8 yuan This problem is solved by quadratic equation. I have solved it for a long time. My problem is to solve the problem in the way of primary school and write down the idea of solving the problem,

52.6-51.8 = 0.8 (a story book - a novel)
52.6 + 51.8 = 104.4 (nine story books + nine Novels)
104.4/9 = 11.6 (one story book + one novel)
0.8 + 11.6 = 12.4 (two story books) 12.4/2 = 6.2 (one story book)
11.6-0.8 = 10.8 (two novels) 10.8 / 2 = 5.4 (one novel)
This is not to set the method of unknowns, it is recommended for primary school students. The first person in front of the answer is to set the method of unknowns, it is recommended for junior high school students. I hope it can help you

Xiao Yun takes 10 yuan, 7 yuan for a story book and 5 yuan and 8 Jiao for a pencil case. Is his money enough? Why?
Xiao Yun takes 10 yuan, 7 yuan for a story book and 5 yuan for a pencil case
Eight yuan, is his money enough? Why?

After reading the book, sell it at a low price of three yuan, and then buy a stationery box

How to calculate 35 / 36 * 29

35/36*29
=（1-1/36)×29
=29-29/36
=28 and 7 / 36

If a and B are rational numbers, the new definition of operation "△"
A △ B = 2Ab + 1, then (- 3) △ 4 =?
Please explain why

（-3）△4=2 *（-3*4）+1=2*(-12)+1=-23

There are 120 five digit numbers composed of 1, 2, 3, 4 and 5. When they are arranged from small to large, what is the 47th number? What are the 85th number and the 100th number?

There are 24 numbers at the beginning of each number, for example, there are 24 numbers from 12345 to 15432, so the 48th number is 25431, so the 47th number is the one in front of 25431, that is 25413,85 = 24 * 4-11, and the last number at the beginning of 4 (that is, the largest number at the beginning of 4, 45321) is the 96th, so the 11 numbers in front are 4531 in turn

What is the condition of a and B contract that matrix A and matrix B are equivalent

The equivalence of matrix A and matrix B is a necessary condition for the contract between a and B, but it is not sufficient
Because the equivalence between matrix A and matrix B is the existence of invertible matrix P, Q, such that PAQ = B, and the contract between a and B is the existence of invertible matrix C, such that c'ac = B, we can see that the contract is a special equivalence

If 540 is divided by a one digit number, the quotient is a two digit number. There are () such one digit numbers. When the quotient is the smallest one of them, the quotient is ()

9 540

What is the law of exponential power operation?

The power of the same base is the same, the base is the same, the exponent is added

There is a column of numbers 1, 3, 4, 7, 11, 18, 29 The first 2008 in this column are divided by 6

First of all, the general items listed in the index should be
a_ 1 = 1, a_ 2 = 3, a_ n = a_ {n-1} + a_ {n-2}
Consider the sequence of the remainder obtained by dividing by 6
1, 3, 4, 1, 5, 0, 5, 5, 4,3,1,4, 5, 3, 2, 5, 1, 0 ,1, 1, 2, 3, 5, 2, 1,3,...
The period of the cycle is 24, and there are two multiples of 6 in the 24
So in the original sequence, the first 2004 term is exactly 334 such cycles, including 668 multiples of 6. Plus the last 4 terms of the first 2008 term (there is no multiples of 6), there are 668 cycles in total
So the final answer is 668

The approximate number is 24000 What are the significant numbers It's accurate to__ A bit

The approximate number of 24000 has three significant numbers, 2, 4, 0, which are accurate to hundreds. So the answer is: 3, 2, 4, 0, 100

Xiao Yun takes 10 yuan, 7 yuan for a story book and 5 yuan and 8 Jiao for a pencil case. Is his money enough? Why? Xiao Yun takes 10 yuan, 7 yuan for a story book and 5 yuan for a pencil case Eight yuan, is his money enough? Why?