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Tình cờ nhặt được cái này ở blog 1 người "quen cũ" không biết mặt: http://blog.360.yahoo.com/blog-ILcm7tEydKky_LJpc.RrCqwm9g--?cq=1&p=35

Hứng chí, google phát ra 1 vài cái nữa.

Sometimes when you’re stuck on a math problem and you just wanna give up, it’s best to go out in style…like these people.

Today I got another one funny math from Atul’s Blog. How much funny is this one? Don’t know? Is their any way to measure how much funny? :-)

$1 = 10cents

Dollars equal ten cents

Theorem: 1$ = 10 cent

Proof: We know that $1 = 100 cents

Divide both sides by 100

$ 1/100 = 100/100 cents

=> $ 1/100 = 1 cent

Take square root both side

=> squr($1/100) = squr (1 cent)

=> $ 1/10 = 1 cent

Multiply both side by 10

=> $1 = 10 cent

Ha Ha Ha

Mock mathematical reasoning

A set of equivocal jokes applies mathematical reasoning to situations where it is not entirely valid. Many of these are based on a combination of well-known quotes and basic logical constructs such as syllogisms:

Example:

Premise I: Knowledge is power.
Premise II: Power corrupts.
Conclusion: Therefore, knowledge corrupts.

There are also a number of joke proofs, such as the proof that Women are evil:

Women are the product of time and money: $mathrm{women} = mathrm{time} times mathrm{money},$
Time is money: $mathrm{time} = mathrm{money},$
So women are money squared: $mathrm{women} = mathrm{money}^2,$
Money is the root of all evil: $mathrm{money} = sqrt{mathrm{evil}}$
So women are evil: $mathrm{women} = left (sqrt{mathrm{evil}}right )^2 = mathrm{evil}$

An alternate version of this joke uses the sign ambiguity inherent in taking the square root of a square:

$sqrt{(-1)^2}=sqrt{(+1)^2}$

to say that

$mathrm{women} = left (sqrt{mathrm{evil}^2}right ) = mathrm{pm evil}$

Thus stating that either women are entirely evil, or entirely good (the opposite, or negative, of evil), but there's no way of knowing which state it is without a further test.

Another set of jokes relate to the absence of mathematical reasoning, or misinterpretation of conventional notation:

Examples:

$Big( lim_{xto 8} frac{1}{x-8} = infty Big) implies Big( lim_{xto 3} frac{1}{x-3} = omega Big)$

(That is, the limit as x goes to 8 is a sideways 8 or the infinity sign, in the same way that the limit as x goes to three is a sideways 3 or the Greek letter omega.)

$frac{sin{x}}{n} = frac{mbox{si}, x}{1} = 6$

Mathematical rebuses

A mathematical formalism is used to spell out words and phrases in the form of a rebus, often of a crude nature. For example, a t-shirt from the University of Chicago reads:

$lim_{U to U(C)} int e^x = 0$

Bearing in mind that the integral symbol is derived from the letter "S", it reads "The limit of sex as U (you) approaches "U of C" is zero", implying that the average U of C student is unlikely to engage in sexual relations.

Calculator spelling

Tangential to mathematics is calculator spelling: words and phrases formed by entering a number and turning the calculator upside down. Due to their crudeness and relative simplicity (requiring only basic calculator skills to achieve), these are usually spread by schoolchildren. Often the words are accompanied by stories involving numbers that lead to the "final solution". A favorite word to spell is hello, which is 0.1134 or 0.7734. Dropping the 0 and changing the number to an integer results in another child's favorite. Another favorite is the spelling of 'I sell boobs' on the calculator which is the number 5800877351.

Math limericks

A Math Limerick is an expression which, when read aloud, matches the form of a limerick. The following is an example which closely matches the form of a limerick:

$int_{1}^{sqrt[3]{3}} t^2, dt ,times, cos frac{3 pi}{9} ,=, ln sqrt[3]{e}$

which reads as follows:

The integral t-squared dt

From one to the cube root of three

Times the cosine

Of three pi over nine

Equals log of the cube root of e

Another, attributed to Leigh Mercer ^[1]:

$(12 + 144 + 20 + 3 times sqrt{4}) div{7} + 5 times 11 = 9^2 + 0$

This is read as follows

A dozen, a gross, and a score

Plus three times the square root of four

Divided by seven

Plus five times eleven

Equals nine squared and not a bit more

Erikka has sent these diagrams, trying to use Math to describe relationship. Click to see more, and check also this atractiveness scale and why a guy will never have a girlfriend.

Another set of funny answers to exams, this time not only math problems. Thanks to dimitrix for this.

1490473739_d7462f6f7d
1491328902_854f16adce
1491327280_0040771e41
1491327496_755a231780
1490472555_8a779497e7
1490471845_3dd2933943
1490473079_770b9dc170
1491328434_8e8a209eb0
1490473579_19646bda5f

World’s Hardest Easy Geometry Problem

Friday, January 4th, 2008. And it is _interesting, science

Why easy? Because it can be solved only with elementary geometry. Why hard? Because the same reason, you have to use only elementary geometry. Hardest? You decide. Please send in solutions. See also these funny math problems.

Elementary Geometry

Here is everything you need to know to solve the above problems.

Lines and Angles: When two lines intersect, opposite angles are equal and the sum of adjacent angles is 180 degrees. When two parallel lines are intersected by a third line, the corresponding angles of the two intersections are equal.

Triangles: The sum of the interior angles of a triangle is 180 degrees. An isosceles triangle has two equal sides and the two angles opposite those sides are equal. An equilateral triangle has all sides equal and all angles equal. A right triangle has one angle equal to 90 degrees. Two triangles are called similar if they have the same angles (same shape). Two triangles are called congruent if they have the same angles and the same sides (same shape and size).

Side-Angle-Side (SAS): Two triangles are congruent if a pair of corresponding sides and the included angle are equal.
Side-Side-Side (SSS): Two triangles are congruent if their corresponding sides are equal.
Angle-Side-Angle (ASA): Two triangles are congruent if a pair of corresponding angles and the included side are equal.
Angle-Angle (AA): Two triangles are similar if a pair of corresponding angles are equal.