200*200 + 1 =
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Tính A=(200-1).(200-2).(200-3)...
Có 200 thừa số
Vì A có 200 thừa số nên thừa số cuối cũng sẽ là ( 200 - 200 )
Khi đó :
A = ( 200 - 1 ) ( 200 - 2 ) ... ( 200 - 200 )
A = ( 200 - 1 ) ( 200 - 1 ) ... 0
A = 0
Vậy A = 0
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A=0 nha
_______________
_____________
hok tốt
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hãy so sánh 20020 -2/20019- 2 và 20019 +1/20018+ 1
200+200+200+200+200+200+200+200+200+2
200+200+200+200+200+200+200+200+200+2
=200x9+2
=1800+2
=1802
h nha may che
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200+200+200+200+200+200+200+200+200+2
=200x8+2
=1600+2
=1602
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200+200+200+200+200+200+200+200
Xem thêm câu trả lời
200+200+200+200+200+200+200+200
Kết quả là 1600 bạn nhé ! k cho mình nha !
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1. We/use/art/communicate/200 yearsA. We will be using art to communicate in 200 yearsB. We will use art for communicating for 200 yearsC. We will have used art to communicating in 200 yearsD. We will be using art for communicating for 200 years2. I/look forward to/hear/you/soonA. I am looking forward to hearing from you soonB. I am looking forward to hear from you soonC. So am I looking forward to hear from you soonD. I look forward to hear from you soon3. The number/English speakers/increas...
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1. We/use/art/communicate/200 years
A. We will be using art to communicate in 200 years
B. We will use art for communicating for 200 years
C. We will have used art to communicating in 200 years
D. We will be using art for communicating for 200 years
2. I/look forward to/hear/you/soon
A. I am looking forward to hearing from you soon
B. I am looking forward to hear from you soon
C. So am I looking forward to hear from you soon
D. I look forward to hear from you soon
3. The number/English speakers/increase/recent years
A. The number of English speakers increase in recent years
B. The number of English speakers have increased in recent years
C. The number of English speakers increased in recent years
D. The number of English speakers has increased in recent years
4. According/latest report/the number/people/injured/typhoon/nearly/150
A. According to the latest report, the number of people injured in the typhoon was nearly 150
B. According to the latest report, the number of people were injured in the typhoon were nearly 150
C. According to the latest report, the number of people injured in the typhoon were nearly 150
D. According to the latest report, the number of people have injured in the typhoon was nearly 150
5. Tsunamis/also/refer/the public/tidal waves
A. Tsunamis also referred to the public as tidal waves
B. Tsunamis also refer to the public as tidal waves
C. Tsunamis is also referred as the public as tidal waves
D. Tsunamis are also referred to the public as tidal waves
Tính tỉ số A/B biết:
A= 1/1*2+1/3*4+1/5*6+...+1/199+200
B= 1/101*200+1/102*199+...+1/200*101
Tính tỉ số A/B biết:
A= 1/1*2+1/3*4+1/5*6+...+1/199+200
B= 1/101*200+1/102*199+...+1/200*101
A = \(\frac{1}{1.2}+\frac{1}{3.4}+...+\frac{1}{199.200}=1-\frac{1}{2}+\frac{1}{3}-\frac{1}{4}+...+\frac{1}{199}-\frac{1}{200}\)
\(=1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{199}+\frac{1}{200}-2\left(\frac{1}{2}+\frac{1}{4}+...+\frac{1}{200}\right)\)
\(=1+\frac{1}{2}+\frac{1}{3}+\frac{1}{4}+...+\frac{1}{200}-\left(1+\frac{1}{2}+\frac{1}{3}+...+\frac{1}{100}\right)\)
\(=\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\)
Lại có B = \(\frac{1}{101.200}+\frac{1}{102.199}+...+\frac{1}{200.101}\)
=> 301B = \(\frac{301}{101.200}+\frac{301}{102.199}+...+\frac{301}{200.101}\)
=> 301B = \(\frac{1}{101}+\frac{1}{200}+\frac{1}{102}+\frac{1}{199}+...+\frac{1}{200}+\frac{1}{101}=2\left(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\right)\)
=> B = \(\frac{2}{301}\left(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\right)\)
Khi đó \(\frac{A}{B}=\frac{\left(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\right)}{\frac{2}{301}\left(\frac{1}{101}+\frac{1}{102}+...+\frac{1}{200}\right)}=\frac{1}{\frac{2}{301}}=\frac{301}{2}=150,5\)
200+200+200+200+200=?
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