LT
8
K
Khách
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26 tháng 12 2016
Bài 1 : Một bài kiểm tra trắc nhiệm có 15 câu hỏi. Nếu khoanh đúng 1 câu thì được cộng 5 điểm , khoanh sai hoặc không khoanh thì bị trừ 5 điểm. Điểm bài kiểm tra của bạn An là 25 điểm . Hỏi An đã khoanh đúng bao nhiêu câu ?
NC
10 tháng 6 2021
Nếu làm đúng hết thì có 12 điểm
- Nếu làm sau 1 câu có 9 điểm
- Nếu làm sai 2 câu có 6 điểm
- Nếu làm sai 3 câu có 3 điểm
- Nếu làm sai 4 câu hoặc không trả lời được có 0 điểm
Ta có:
Lần lượt các số điểm 9, 6, 3, 0
Mà có 6 học sinh thi giải toán
Vậy chắc chắn có có hai bạn có điểm bằng nhau
16 tháng 3 2023
gọi sô bài giỏi là a,yếu là b,cả
trung bình và khá là c (a,b,c thuộc N*;c=8).theo bài ra ta có:a+b+c=35 <-> a+b+8=35 <-> a+b=27 <-> a=27-c (1)
lại có 20a+8*5-10c=130
<->20a-10c=90
<->2a-c =9 (2)
thay (1) vào (2) -> 2*(27-c)-c=9
<-> 54-3c =9
<-> c =15
-> a =12
Vậy số bài giỏi là 12 bài, số bài yếu là 15 bà
CA
18 tháng 10 2018
(=) 2x.24+2x=34
(=) 2x.(16+1)=34
(=) 2x.17 =34
(=) 2x =2
=) x = 1
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18 tháng 10 2018
Các số từ 1 đến 9 có 9 chữ số.
Các số từ 10 đến 99 có 90 số và có số chữ số là: 90 x 2 = 180 chữ số
Số 100 có 3 chữ số nên sẽ cần số chữ số là: 9 + 180 + 3 = 192 chữ số
Đáp số: 192 chữ số
Chúc bạn học tốt!
TL :
1 + 1 =2
trừ 25% số điểm...
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