2.5 * 10.5 simple calculation formula,

2.5 * 10.5 simple calculation formula,

2.5*10.5
=2.5*(10+0.5)
=2.5*10+2.5*0.5
=25+1.25
=26.25

7 / 9 △ 11 / 5 + 2 / 9 × 5 / 11

7/9÷11/5+2/9x5/11
=7/9x5/11+2/9x5/11
=(7/9+2/9)x5/11
=5/11

Simple operation: 11 × 11 × 11-11 × 11-10

11×11×11-11×11-10=11×11×（11-1）-10=11×11×10-10=10×（11×11-1）=10×【11×（10+1）-1】=10×（11×10+11-1）=10×（110+10）=10×120=1200

On the usage and difference of sport and sports
Is a specific sport sport or sports?
Sport or sports?
What is you favorite sport? Or what is you favorite sports?
What sport do you like best?

Sport is a general term
What is you favourite sport?
Correct statement
which sport do you like best?
This should also use sport, but need to use which question to conform to the grammar

The perimeter of the triangle ABC is 41cm, and the edge BC is 17cm. The angle bisector ad divides the triangle ABC into two parts with an area ratio of 3:5, and ab is greater than AC, then ab
nothing

The angle bisector ad divides the triangle ABC into two parts whose area ratio is 3:5, and ab is greater than AC, (24-b) / b = 5 / 3B = 9C = 15A = 17. Next, I don't know what else to ask for? If we want to find the area of the triangle ABC, because the lengths of the three sides are determined, the triangle will be determined, and the area must be easy to find

Judgment question: the greatest common factor and the least common multiple of natural number a (except 0) are the same ()

1. Common factor: the common factor of several numbers is called the common factor of these numbers, and the largest one is called the greatest common factor of these numbers
2. Common multiple: the common multiple of several numbers is called the common multiple of these numbers, and the smallest one is called the least common multiple of these numbers
A is a number, not several, so this question is wrong=

What is the relationship between area ratio and perimeter ratio of similar triangles?

Square of perimeter ratio of similar triangle = area ratio

Two two digit numbers, their greatest common factor is 9, and their least common multiple is 360. What is the sum of these two numbers?

Two two digit numbers, their greatest common factor is 9 and the least common multiple is 360, then the sum of these two numbers is 117

If the line L1 is parallel to L2, then the slopes of the two lines are equal. Why not

Two straight lines with equal slopes must be parallel;
The slopes of two parallel lines are not necessarily equal (because the inclination angles of the two lines are equal to 90 degrees)

This is an apple

These are some apples.