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Darina [25.2K]
3 years ago
9

Tại Trường Tiểu học ABC, số học sinh của Khối lớp 1, Khối lớp 2, Khối lớp 3, Khối lớp 4 và Khối lớp 5 chiếm tỉ lệ lần lượt là 28

%; 22%; 20%; 16% và 14% tổng số học sinh toàn trường. Trong mỗi Khối, tỉ lệ học sinh giỏi năm nay của Khối lớp 1 là 45%, Khối lớp 2 là 50%, Khối lớp 3 là 55%, Khối lớp 4 là 65% và Khối lớp 5 là 75%. Xét trong Khối lớp 1, tỉ lệ học sinh giỏi của Khối lớp 1 là bao nhiêu?
Mathematics
1 answer:
-Dominant- [34]3 years ago
6 0

Answer:

hello bro

Step-by-step explanation:

can you translate it on english so i can help you

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A number is doubled and then the product is increased by 6. This sum is then multiplied by -3, and the result is 54 greater than
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Step-by-step explanation:

Let the number be x

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Television and radio stations use four call letters starting with w or​ k, such as wxyz or krld. assuming no repetitions in the
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We are allowed to use only lettrs from F to X. That's total of 19 letters. We are not allowed to repeat letters so for each letter we can choose from one less available letters.

Let's start with names begining with W. We will write how man possible letters we can choose from.
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</span>At second possition we can choose from 18 letters because we must not repeat letters and W is placed in front of X in alphabet.
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Total number of possible names starting with W or K is 4896 + 4896 = 9792
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