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What triangle is (a-b) (B-C) (C-A) (A2 + b2-c2) = 0 △ ABC
(a-b)(b-c)(c-a)(a2+b2-c2）=0
A-B = 0 isosceles triangle
B-C = 0 isosceles triangle
C-A = 0 isosceles triangle
A2 + b2-c2 = 0 right triangle
A and B are prime numbers. Their least common multiple is 91. What are a and B
13 and 7
a. B are different prime numbers, and 1 / A + 1 / b = 20 / 91, what are a and B?
1/a＋1/b=（a+b）/ab
So a + B = 20, ab = 91
91=13X7
So a. B is 13 and 7 respectively
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