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What is the difference in meaning between the notations QR and qr?
No
Who invented QR code?
The Quick Response (or QR) Code was invented by the Denso Wave company to track the vehicle manufacturing process.
Difference between bar code and qr code?
Bar code stores numbers only,but QR code can be store be with any multimedia.
Point b is between q and r on qr and qb equals 20 br equals 10?
This isn't a question, even. It's a statement about a line segment, QR.
Why is the difference between two rational numbers always a rational number?
Suppose x and y are two rational numbers. Therefore x = p/q and y = r/s where p, q, r and s are integers and q and s are not zero.Then x - y = p/q - r/s = ps/qs - qr/qs = (ps - qr)/qsBy the closure of the set of integers under multiplication, ps, qr and qs are all integers,by the closure of the set of integers under subtraction, (ps - qr) is an integer,and by the multiplicative properties of 0, qs is non zero.Therefore (ps - qr)/qs satisfies the requirements of a rational number.
