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kupik [55]
3 years ago
9

Kayla had 3/4 of her book left to read on Sunday night.she read 1/5 of the book Monday afternoon and 1/4 of the book Monday even

ing. What fraction of the book did she still have left to read after Monday
Mathematics
1 answer:
xenn [34]3 years ago
6 0

She would have 3/10 of the book to read after Monday.

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Let a=2 mn, n=m^2-n^2, and c = m^2 + n^2 be the sides of a pythagorean triangle. Suppose that b=a+1, Show that (m-n)^2 -2n^2 = 1
katen-ka-za [31]

A: Assuming you intend b = m^2 - n^2, you can substitiute the given expressions for "a" and "b" and rearrange the equation to get the desired result.

... b = a + 1

... m^2 -n^2 = 2mn + 1 . . . . . substitute for a and b

... m^2 -2mn - n^2 + 2n^2 - 2n^2 = 1 . . . . . subtract 2mn, add 2n^2 - 2n^2 on left

... (m -n)^2 - 2n^2 = 1 . . . . . . .simplify to get the desired form


B: This is a Pell equation of the form

... x^2 -2y^2 = 1 . . . . . . . . . . . . where x = (m-n) and y = n

It has solutions that can be derived from the convergents of the continued fraction expansion of √2. That continued fraction is of the form

... √2 ≈ 1 + 1/(2 + 1/(2 + 1/(2 + ...))) . . . . where the denominator fractions continue in the same pattern. The first few convergents are

... 1, 3/2, 7/5, 17/12, 41/29, 99/70, 239/169, ...

Every other one gives rise to a solution. For example, 3/2 tells you x=3, y=2, so

... m=3+2=5, and n=2.

The second-smallest solution is x=17, y=12, so

... m=17+12=29, and n=12.


The corresonding two smallest triangles are

... {a, b, c} = {20, 21, 29}, {696, 697, 985}

5 0
3 years ago
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