 | Braithwaite Arnett - 1874 - 130 pàgines
...number 20 into two snch parts that the square of the greater shall exceed the square of the less by 80. Prove that if any number be divided into two parts,...of these parts is least when the parts are equal. 9. A railway train travels 288 miles at a certain average speed, and if the speed were 4 miles an hour... | |
 | 1905 - 694 pàgines
...into two parts, a and Ъ, so that 3a2+4b2 is a minimum, Vi2(3a2+4b2)=a2/4+bV3 will also be a minimum. If any number be divided into two parts the sum of the squares of the two parts is a minimum when the two parts are equal. We prove this as follows: Let x and у be... | |
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A railway train travels 288 miles at a certain average speed, and, if the speed were 4 miles an hour greater, would perform the journey in an hour less. What is the... 