Use 2, 5, 4 and 8 to form two two digit numbers. The product of the two two digit numbers is the largest______ The smallest is______ ．

Use 2, 5, 4 and 8 to form two two digit numbers. The product of the two two digit numbers is the largest______ The smallest is______ ．

According to the nature of multiplication and digital knowledge, the four numbers 2, 5, 4 and 8 can form two digits. The maximum product is 54 × 82 = 4428, and the minimum product is 25 × 48 = 1200. So the answer is: 44281200

There are 180 students in the sixth grade of experimental primary school, among which the number of girls is 9 / 11 of that of boys. How many boys and girls are there in the sixth grade?

Male = 180 ÷ (1 + 9 / 11) = 99
Female = 180-99 = 81
Do not understand can ask, help please adopt, thank you!

There are 180 students in the sixth grade of the experimental primary school, among which the female students are 9 / 11 of the male students?
When I look at others, 180 / (1 + 9 / 11) = 99. Why use 1 + 9 / 11?

You can use the idea of equation to understand, let boys be x, girls be 9 / 11x. Then there is the equation x + 9 / 11x = 180, X (1 + 9 / 11) = 180, so x = 180 / (1 + 9 / 11). In this way, we can get the number of boys, the number of girls is OK as soon as we reduce it!

How many students are there in grade six, including 35 boys and 35 girls?

A: there are 72 girls in Grade 6

There are 930 students in grade five and grade six. It is known that three-quarters of the students in grade five are equal to four-quarters of the students in grade six. How many students are there in grade five and grade six?

Three quarters of the fifth graders are equal to four fifths of the sixth graders
The ratio of the two is (4 / 5): (3 / 4) = 16:15
Grade 5 930 * 16 / (16 + 15) = 480
Grade 6 930-480 = 450

There are 930 students in Grade 5 and 6 of the experimental primary school. Three quarters of the students in Grade 5 are equal to four fifths of the students in Grade 6. How many students are there in Grade 5 and grade 6?

There are X students in grade five and y students in grade six
X +Y=930
3/4X=4/5Y
X=930-Y
3/4*（930-Y）=4/5Y
3/4*930-3/4Y=4/5Y
31/20Y=1395/2
Y = 450
X+Y=930
X=930-450
X = 480 A: there are 480 students in grade five and 450 students in grade six

There are 210 students in the fifth grade of experimental primary school. The number of students in the fifth grade is 7 / 9 of that in the sixth grade,
There are also 2 adults whose blood accounts for about 1 / 13 of their body weight. How many kilos does the blood weigh for a person who weighs 65 kg?
3. The running speed of EMU is 240 km / h, and ordinary train is 7 / 12 slower than it. What is the speed of ordinary train?
4. There is a pile of cement on the construction site. After 7 / 10 of it has been used, there are still 60 tons left. How many tons of this pile of cement are there?
A mobile phone is one fifth cheaper than before, which is 200 yuan cheaper than before. How much is it before the price reduction?
Use the equation solution, remember to mark the number, write the equation, do not have to write the process
Wait, I can do 2, 3, 4, 5, just ask for the formula of the topic. If you can use the equation, use the equation. If you can use the formula, use the formula

There are 210 students in the fifth grade of the experimental primary school. The number of students in the fifth grade is 7 / 9 of that in the sixth grade. How many people in the sixth grade are set as the sixth grade x person? 7 / 9x = 210x = 210 △ 7 / 9x = 270 2. The blood of an adult accounts for about 1 / 13 of the body weight. How many kilogram is the blood of a 65 kilogram person? Set the blood weight as X kilogram 65 × 1 / 13 = 5

There are 30 sixth grade students in the art group of the experimental primary school,
There are 30 sixth grade students in the art group of the experimental primary school, and how many fifth grade students are there in the art group?

30 * (1-20%) = 24 (persons)

The number of male and female students in each grade of the experimental primary school is as follows:
Male students
Female students
1. How many students are there in the whole school? What percentage of the students in grade six?

1. Total number of students in the school:
46 + 38 + 54 + 42 + 48 + 45 + 42 + 50 + 40 + 48 + 44 + 40 = 537 (person)
2. The percentage of sixth grade students in the total number of students in the school:
　　　　（44＋40）/537=15.6%

Three classes in grade one donated books to hope primary school. Class one won 152 books. The number of books donated by class two is the average of the three classes. The number of books donated by class three is 40% of the total number of books donated by grade three. How many books did the three classes donate?
Y is solved by a linear equation of one variable,

Set up two classes to donate x books
152 + X + 1.2x = 3x, x = 190
Three classes donated 570 copies in total
PS: generally, no one wants to answer the questions that are not scored, so I'd better add some points next time~