What si 9  plus 9  subtract 9 multiply  9 divide by 9 times 99999?
446526
the first one is 899991\nthe second one is 8090919
42969
Nine has TWO square roots: -3 and +3.
304243
9^8 is 9 times itself 8 times\n9^8\n= 9*9*9*9*9*9*9*9*9\n= 43046721
612325
length = 9\nwidth = 9
124188
1398\n\nEasy way:\nRound 399 to 400 (+1)\nRound 999 to 1000 (+1)\nAdd 1000+400=\n1400\nSubtract the two you added.\n1398
886343
1/9(x-1)^9 evaluated from 0 to 2.\n\n1/9(1)^9 - 1/9(-1)^9 = 1/9 + 1/9 = 2/9\n\nIf I didn't screw up.
408271
take the cube root of 729 u get 9
707878
- a/b over 9/b = -(a/b) ( b/9) = -a/9 \nand\n(3) - a/b over 9/b = (3b-a)/b (b/9) = (3b-a)/9\n:D
841203
(-9)(-9)^3\n(-9)(-9)(-9)(-9)\n(-9)(-729)\n=6561\n\nx^5 * y^2\n----------\nx^4 * y^0\n\nwhen you divide, subtract the exponents to get\n\n=x^1y^2\n\n=xy^2
748322
The numbers for this particular answer are 9 and 10.\n\n9 + 10*3\n9 + 30\n=39
816947
999 / 89 = 11.2247191\n\ndid you know that Google can act like a calculator?\n\nhttp://www.google.com/search?hl=en&lr=&safe=off&q=999+%2F+89&btnG=Search
678031
psbhowmick, 99 is divisible by 9, but 199 is not. You can't find the remainder simply by looking at the last 2 digits. For instance, the remainder of 22654785/19 is 2, not 9 as you suggest.\n\nDividing by 19, hmmm... the only shortcut I can think of is to use the mod function on your calcutor. Sorry.
373987
of cos!\n\n9*9 + 9 + 9 + 9/9 + (9-9)9
1137023
(2x-9)(2x+9)\n\na guess... its been a long time since I did that stuff
1127621
Actually the above "proof" is misleading. \n\nx=0.999...99\n\n10x=9.999...90 (as anything x10 adds a zero to the end as the decimal place shifts, even if the number is infinite)\n\n9x=10x-x\n=9.999...90-0.999...99\n=8.999...81\n\nx=9x/9=8.999...81/9=0.999...99\n\nTherefore 0.999...99 does not equal 1....mathematics isn't independent of logic. Beware of those who try to make it so.
529699
The first thing to do is "distribute" the 9:\n\n9*x - 9*7 -5x = 2x + 10, so rewrite it:\n9x - 63 - 5x = 2x + 10, now combine the x's on the left side:\n4x - 63 = 2x + 10 (remember it's MINUS 5x), now get rid of the 2x by subtracting it from both sides (it makes zero on the right), leaving:\n\n2x - 63 = 10 and now ADD 63 to both sides:\n2x = 73... divide by 2 on both sides:\nx = 36.5\n\nDoes that help?
358921
(9^9)!\n\ni.e. factorial of 9 to the power 9\n\n\n\n\n\n\n--- ► λ ◄