1.oblicz liczby gdy
1.oblicz liczby gdy x=
x = (2½ - 1¼)*(2½ + 1¼)
stosuję wzór skróconego mnożenia :
(a -b)*( a +b) = a² - b²
x = (2½)² - (1¼)²
x = (5/2)² - (5/4)²
x = (10/4)² - (5/4)²
x = 100/16 - 25/16
x = 75/16
¾x = ¾*75/16 = 225/64 = 3 i 33/64
Stosuję wzór skróconego mnozenia:
(a-b)(a+b) = a^2 - b^2
x =(2 1/2 -1 1/4)(2 1/2 +1 1/4)
x =(2 1/2)^2 -(1 1/4)^2
x =(5/2)^2 -(5/4)^2
x =25/4 - 25/16
x =100/16 -25/16
x =75/16
3/4 x =3/4 *75/16 =225/64 =3 33/64
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1.oblicz liczby gdy x=
x = (2½ - 1¼)*(2½ + 1¼)
stosuję wzór skróconego mnożenia :
(a -b)*( a +b) = a² - b²
x = (2½)² - (1¼)²
x = (5/2)² - (5/4)²
x = (10/4)² - (5/4)²
x = 100/16 - 25/16
x = 75/16
¾x = ¾*75/16 = 225/64 = 3 i 33/64
Stosuję wzór skróconego mnozenia:
(a-b)(a+b) = a^2 - b^2
x =(2 1/2 -1 1/4)(2 1/2 +1 1/4)
x =(2 1/2)^2 -(1 1/4)^2
x =(5/2)^2 -(5/4)^2
x =25/4 - 25/16
x =100/16 -25/16
x =75/16
3/4 x =3/4 *75/16 =225/64 =3 33/64