X square + 12x = 27

X square + 12x = 27

（x+6）=63 x+6=±√63 x1=3√7-6 x2=-3√7-6

After the earthquake, more than 460 boys and girls donated money, accounting for 30.5% of the total amount of money
The ratio is 2:3. How much money does the class donate?

There is a donation of X Yuan for this class
Then x · [3 / (2 + 3)] - x · (2 / 5) = 460
X = 2300 yuan
The class donated 2300 yuan in total

5.12 "after the Wenchuan earthquake, teachers and students of a school enthusiastically donated money. 60% of the female students in a class of grade 6 donated 32 yuan less than 40% of the whole class. The male students donated two-thirds of the female students. How much money did the class donate to the disaster area?

It's OK to use a linear equation of one variable
If the female student donates X Yuan, the whole class donates (60% x + 32) divided by 40% yuan
(60% x + 32) divided by 40% - x = two thirds times x
The solution is x = 80
60％×80÷40％
=48÷0.4
=120

How much is the donation of the United States and other countries in the world after the Wenchuan earthquake in China?

Comparing the donations of countries around the world during the Wenchuan earthquake in China and the hurricane in the United States, although this topic has little to do with our auto forum, I feel very much after seeing it. I'd like to add and forward it to let you have a look. Compared with the hurricane in the United States, the Wenchuan earthquake in Sichuan has caused more economic losses and lost more lives

Shenzhen Lianhua primary school donated 6300 yuan to five classes of grade six in the activity of "giving love to donate money to poor areas". Among them, class one donated 1400 yuan, class two donated 100 yuan less than class one, class three donated 20% of the total number of grades, and the ratio of class three to class four donated 67 yuan?

Donation amount of class 3: 6300 × 20% = 1260 (yuan); & nbsp; & nbsp; donation amount of class 4: 1260 △ 67 = 1470 (yuan). Answer: donation amount of class 4: 1470 yuan

A primary school in Shenzhen is donating 6300 yuan to five classes of grade 6 in the donation activity for poverty alleviation areas in Guizhou Province. Among them, one class donated 6300 yuan, and the second class donated less than the first class
A primary school in Shenzhen is donating 6300 yuan to five classes of grade 6 in Guizhou poverty alleviation area. Among them, class 1 donates 1400 yuan, class 2 donates 100 yuan less than Class 1, class 3 donates 20% of the total number of grades, and the ratio of class 4 to class 5 donates 6 to 7

If it's 6x yuan for class four, it's 7x yuan for class five,
6x+7x+1400+1400-100+20%×6300=6300
13x+2700+1260=6300
13x=6300-3960
13x=2340
x=180
∴6x=180×6=1080

A primary school in Shenzhen donated 4000 yuan to four classes of grade 6 in the activity of "giving love to the earthquake stricken areas in Sichuan"
Among them, class one donates 1000 yuan, class two donates 20% of the total donation of grade six, and the ratio between class three and class four is 5:6. How much should class four donate?

Then the donation of class 2 is 4000 × 20% = 800 yuan. The total donation of class 3 and class 4 is 4000-1000-800 = 2200 yuan
5 + 6 = 11 class 3: 2200 × 11 / 5 = 1000 yuan class 4: 2200 × 11 / 6 = 1200 yuan

After the Wenchuan earthquake, we actively donated money and responded to the school's activity of "offering love to children in disaster areas"
What's wrong?

The word order is wrong, and the verb object is not matched, so the response activity is not good
After the Wenchuan earthquake, we responded to the school's call to "offer love to children in disaster areas" and actively donated money

Write a letter to the children in Wenchuan
1. Self introduction
2. Where I live
3. What will be done to strengthen ties

What time is it now? Do you still write this?
To tell you the truth, LZ you follow:
1. Self introduction
2. Where I live
3. What will be done to strengthen ties
Don't you just write in purple?

"SMS Mom" in Wenchuan earthquake, where is the child now?

Although I don't know where he is, he is very safe and now he is growing up!