Factorization factor: square of x-4 * square of x-12x The square of 3M (2x-y) - the square of 3 * m * n

Factorization factor: square of x-4 * square of x-12x The square of 3M (2x-y) - the square of 3 * m * n

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x³-4x²-12x
=x（x-6）(x+2)
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9x square - 12x + 4 = 0, the equation is solved by factorization

9x^2-12x+4=0
(3x-2)^2=0
x1=x2=2/3
Because it is a quadratic equation with one variable, there will be two equal real roots

How to make the square of X - 12x + 27?

Original form
=x²-（3+9）x+3×9
=（x-3）（x-9）
 

Li Ming collects 40 stamps, and Wang Hong collects two seventh more than Li Ming. How many stamps does Li Ming collect less than Wang Hong? Why

40×（1+2/7）-40=?
Wrong title, right

Wang Hong and Li Ming collected a total of 240 stamps. Three eighths of Li Ming's is exactly three fourths of Wang Hong's. how many stamps did Li Ming collect

Three eighths of Li Ming's is exactly three fourths of Wang Hong's, which shows that Li Ming is twice of Wang Hong's
Then 240 / 3 * 2 = 160

A primary school donated money to the Wenchuan earthquake stricken area. It is known that the donation amount of the sixth grade is 1.6 times that of the fifth grade, 360000 yuan. Then how many tens of thousands of yuan each of the fifth and sixth grade students donated? Use the equation to solve the problem

Set up the fifth grade and donate x ten thousand yuan
The sixth grade is 16000 yuan
therefore
1.6x-x=0.36
0.6x=0.36
x=0.6
1.5x=0.96
therefore
The fifth grade donated 6000 yuan
The sixth grade donated 9600 yuan
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The seventh grade students donated 131 yuan to the Wenchuan earthquake area, which is just 2 yuan per person and 35 yuan more. How many students are there?

In the donation activities for the Wenchuan earthquake disaster area in 200, Xiangyang primary school donated 40000 yuan to the disaster area, and Lantian primary school donated 1500 yuan more than Xiangyang primary school
How many million yuan did the University donate?

Total = 4 / 5 + 4 / 5 + 0.15 = 17500 yuan

Three classes in Grade 6 of Xiangyang primary school donated money to the disaster area. One class donated 2 / 3 of the total donation of the other two classes. The second class donated 3 / 5 of the total donation of the other two classes. The third class donated 720 yuan less than the second class. How many yuan did the three classes donate in total?

Because class 1 donated 2 / 3 of the other 2 classes, class 1 donated 2 / 5 of the total
Because class 2 donated 3 / 5 of the other 2 classes, class 2 donated 3 / 8 of the total
1-2 / 5-3 / 8 = 9 / 40, so class 3 donated all 9 / 40
720÷(3/8-9/40）
=720÷（3/20）
=4800 yuan
So the three classes donated 4800 yuan in total

In the donation activities in Wenchuan earthquake stricken areas, Xiaohong donated 12.5 yuan, and Xiaoxia donated 4 times more than Xiaohong. How much did Xiaohong and Xiaoxia donate in total?

Total = 12.5 × (1 + 4) + 12.5 = 75 yuan