(1-1/2)*(1-1/3)*(1-1/4)*(1-1/5)*...*(1-1/10)=...
HELP ME, HURRY UP!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
K
Khách
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P
0
DT
Đỗ Thanh Hải
CTVVIP
6 tháng 9 2021
1. Hurry up or you will be late.
[ If .....................you don't hurry up, you will be late. ............................................................................................................
2. She is very busy, so she can’t help me now.
[ If .......................she weren't busy, she could help me now..........................................................................................................
3. You’re unfit because you don’t take exercise.
[ If .....................you took exercise, you would be fit............................................................................................................
4. Unless you are careful, you will cut yourself with that knife.
[ If ................you aren't careful, you will cut yourself with that knife. .................................................................................................................
5. If I have time, I’ll help you.
[ Unless .........................I have time, I ươn't help you...............................................................................................
6. Dick often causes accidents because he drives carelessly.
[ If ........................Dick didn't drive carelessly, he wouldn't cause accidents.........................................................................................................
7. I can’t apply for that job because I don’t know English.
[ If ......................I knew English, I could apply for that job ...........................................................................................................
8. Leave me alone or I’ll call the police.
[ Unless ......................you leave me alone, I’ll call the police. ..................................................................................................
C
17 tháng 6 2017
\(a\left(\frac{1}{2}-\frac{1}{4}+....+\frac{1}{8}-\frac{1}{10}\right).y=\frac{1}{3}\)
\(\left(\frac{1}{2}-\frac{1}{10}\right).y=\frac{1}{3}\)
\(\frac{2}{5}.y=\frac{1}{3}\)
\(y=\frac{1}{3}:\frac{2}{5}\)
\(y=\frac{5}{6}\)
\(b,\left(\frac{1}{1}-\frac{1}{3}+\frac{1}{3}-\frac{1}{5}+....+\frac{1}{9}-\frac{1}{11}\right).y=\frac{2}{3}\)
\(\left(\frac{1}{1}-\frac{1}{11}\right).y=\frac{2}{3}\)
\(\frac{10}{11}.y=\frac{2}{3}\)
\(y=\frac{2}{3}:\frac{10}{11}\)
\(y=\frac{22}{30}\)
NT
1
21 tháng 5 2023
( 1/2 + 1/3 + 1/4 + ... + 1/10 ) . x = 1/9 + 2/8 + ... + 9/1
=> x = ( 1/9 + 2/8 + ... + 9/1 ) : ( 1/2 + 1/3 + ... 1/10 )
=> x = ( 9/1 + 8/2 + ... + 2/8 + 1/9 ) : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=>x = [ ( 9 - 1 - 1 -... - 1 ) +( 8/2 + 1 ) + ( 7/3 + 1 ) + ... + ( 1/9 + 1 ) ] : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=> x = ( 1 + 10/2 + 10/3 + ... + 10/9 ) : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=> x = [10 . ( 1/2 + 1/3 + ... + 1/9 ) ] : ( 1/2 + 1/3 + 1/4 + ... + 1/10 )
=> x = 10
Chúc Bạn Học Tốt
#𝗝𝘂𝗻𝗻
22 tháng 9 2017
Nguyễn Trà My
Phần a)
\(3\times\left(\frac{1}{2}-x\right)+\frac{1}{3}=\frac{7}{6}-x\)
\(32-3x+13=76-x\)
\(116-3x=76-x\)
\(116-76=3x-x\)
\(46=2x\)
\(x=46\div2\)
\(x=13\)
8 tháng 1 2018
/x+5/+/x-1/=12:/y+5/+3
suy ra x+5+x-1=12:/y+5/+3 hoặc x+5+x-1=12:-<y+5>+3
DT
Đỗ Thanh Hải
CTVVIP
18 tháng 8 2021
Tham khảo
1. Hurry up or you will be late.
→→ If you don't hurry up, you will be late.
2. She is very busy, so she can't help me now.
→→ If she wasn't/weren't busy, she could help me now.
3. You're unfit because you don't take exercise regularly.
→→ If you took exercise regularly, you would be unfit.
4. Unless you are careful, you will cut yourself with that knife.
→→ If you aren't careful, you will cut yourself with that knife.
5 Unless I have time, I won't help you
6 Dick often causes accidents because he drives carelessly.
→→ If Dick didn't drive carelessly, Dick wouldn't cause accidents.
7 I can't apply for that job because I don't know English.
→→ If I knew English, I could apply for that job.
8 Susan is overweight because she eats too much chocolate.
→→ If Susan didn't eat too much chocolate, she wouldn't be overweight.
9 His father often punishes him for his laziness.
→→ If he didn't be lazy, his father wouldn't punish him.
10 Study harder or you'll fail in the next exam.
→→ If you don't study harder, you'll fail in the next exam.
Kết quả là \(\frac{1}{10}\)
Vì \(1-\frac{1}{2}=\frac{1}{2}\)nên \(1-\frac{1}{10}=\frac{1}{10}\)
k mình nha