Answer:In the year 1790, some workers 1. _______________ (discover) the calendar when 2. ____________ (be) making repairs in Mexico City. By order of General Porfirio Díaz, Mexicans 3. ________________ (move) the find to the National Museum of Anthropology in 1885. The Aztec calendar 4. _______________ (be) one of the most important objects of Aztec culture. Not only 5. ________________ (show) the days but 6. _________________ (calculate) how 7. __________________ (move) the Sun, the Moon, and the planet Venus. The Aztecs 8. ________________ (build) this calendar. 9. _________________ (Be) a very large circle-shaped stone and 10. _________________ (weigh) 20 tons. At its center, 11. _________________ (have) the face of Tonatiuh, the sun god, who is surrounded by other symbols 12. _________________ (represent) the universe. The Aztecs 13. ______________ (have) the belief that to maintain the order of the system of the universe 14. ________________ (must) do certain ceremonies. For example, the ancient inhabitants of Mexico City 15 ._______________ (put) the calendar in a horizontal position as if it were a mirror of the sky.
Explanation:
Answer:
Los términos anteriores se pueden escribir como,
( x
2
+2 x y+y
2
)-( un
2
+2 a b+B
2
)
Lo sabemos ( un+b )
2
=a
2
+2 a b+B
2
y ( un-b )
2
=a
2
-2 a b+B
2
( x
2
-( 2×X×y )+y
2
)-( un
2
+( 2×a×b )+B
2
)
( x-y )
2
-( un+b )
2
Lo sabemos , a
2
-B
2
=( un+b ) ( un-b )
[ ( x-y )+( un+b ) ] [ ( x-y )-( un+b ) ]
( x-y+a+b ) ( x-y-a-b )
Explanation:
