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1 天前 · Madonna Louise Ciccone [a] ( / tʃɪˈkoʊni /; born August 16, 1958) is an American singer, songwriter, and actress. Nicknamed the " Queen of Pop ", she has been recognized for her continual reinvention and versatility in music production, songwriting and visual presentation. Madonna's works, which incorporate social, political, sexual, and ...
1 天前 · The number π (/ p aɪ /; spelled out as "pi") is a mathematical constant that is the ratio of a circle's circumference to its diameter, approximately equal to 3.14159.The number π appears in many formulae across mathematics and physics.It is an irrational number, meaning that it cannot be expressed exactly as a ratio of two integers, although fractions such as are commonly used to ...
