Math Is Fun Forum
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 Help Me ! » modular arithmetic question! » 2007-04-03 04:32:39
- user1234
- Replies: 6
hi! i am confused on how you would work out the following with modular arithmetic:
2^-1 mod 9
that is 2 to the power of -1 in mod 9. how would you work it out if the mod is not a prime?
and why does it make difference whether its prime or not?
thank you! 
#2 Help Me ! » can u please help me with algebra? » 2006-12-22 00:37:26
- user1234
- Replies: 3
hi. do you know how i could solve the folowing simultaneous equation?
y = 3x - 1
y = 2x + 5
Can someone explain how you can solve this?
thanks alot!!
#3 Re: Help Me ! » newbie help (again)! » 2006-12-10 22:26:58
thats supposed to be 2'13 sorry... anyway this is what i am trying to do how do i put the number -1999 into this form A x 2'b (A and b must be whole numbers) can give me an answer to this plz? and tell how i can work it out. (A can be a maximum of 63, and b should be max of 31) cheers!
#4 Help Me ! » newbie help (again)! » 2006-12-10 05:16:53
- user1234
- Replies: 2
hi. does anyone know how can simplify this 0.7855 x 2'6 (2'6 is 2 to the power of 6) into whole numbers like this 3 x 2'-3 (i know this is not the correct answer) any suggestions? thanks 4 ur help?
if u dont get what i mean:
e.g
0.65625 x 21'3
=5376
can be simplifies to whole numbers like this:
42 x 2'7
= 5376
which also gives the same answer. is there any method of working this out??
#5 Re: Help Me ! » any maths genuises? help plz! simple question. » 2006-12-09 04:02:47
ok thanks alot guys!! )
Good luck. Hope you find your answer in a math book.
LOL...
#6 Help Me ! » any maths genuises? help plz! simple question. » 2006-12-08 01:20:59
- user1234
- Replies: 8
hi. can someone tell how i could simplify numbers for example like this: 150000 is also 15x10 to the power of 4. how could i do this with this number for example -1999?? how do i find the exponent? i know the mantissa would be something like 1.999. any ideas? thanks for ur help!
p.s. i need to multiply by 2, because i will be working in binary.
#7 Re: Help Me ! » this is mysterious! binary subtraction » 2006-11-21 05:15:15
thanks alot. that definately explained my problem!
#8 Help Me ! » this is mysterious! binary subtraction » 2006-11-21 02:47:25
- user1234
- Replies: 4
hi. i have a problem with binary subtarction. i am trying to subtract 11010110 - 01000111 showing the difference and borrow as well but i get the wrong answer. can u help me?
1101 0110
-
0100 0111
-----------------------------------
Difference: 10010001
Borrow: 00000001(0)
-------------------------------------
Answer: 010010111
i get this as the answer but its not correct, because if you check this in Calculator (View > Scientific) you get the answer 10001111.
I cant see where i am going wrong. all help is greately appreciated!
Pages: 1