Cálculo simple de las calificaciones de quinto grado
Problemas simples de cálculo de fracciones:
1
(90 1/88)×1/89
=(90×88 1)/88×1. / 89
=[(89 1)×(89-1) 1]/88×1/89
=[89^2-1^2 1]/88× 1/89
=89^2/88×1/89
=89/88
2,
(1/ 3 -1/4) (1/4-1/5) (1/5-1/6)
=1/3-1/4 1/4-1/5 1/5- 1 /6
=1/3-1/6
=1/6
3,
1-1/( 1 *2) 1/(2*3) …… 1/50*51
=1-(1-1/2) (1/2-1/3) …… (1/50 - 1/51)
=1-1 1/2 1/2-1/3 1/3-1/4…… 1/50-1/51
= 1 -1/51
=50/51
Sin proceso de cálculo:
1.(1/2 1/4 1/6 1/8) - (1/3 1/6 1/9 1/12) (1/4 1/8 1/12 1/ 16)-(1/5 1/10 1/15 1/20)
2.(260/31÷374/161÷598/197)/42÷(1/2 1/3 1/5)
3.(1/2 1/3 1/5) ÷ 1/30 (1/3 1/5 1/7)÷1/105 (1/5 1/7 1/9)÷1/315
4.(1/11 1/21 1/31 1/41)×(1/21 1/31 1/41 1/ 51)-(1/11 1/21 1/31 1/41 1/51)×(1/21 1/31 1/ 41 )
5.(1 1/2 1/3 …… 1/1999)×(1/2 1/3 …… 1/2000)-(1 1/2 1/3 …… 1/2000)×(1/2 1/3… 1/1999)
6.(1-1/2^2)×(1-1/3^2)×(1-1 /4^2)×……×(1-1/2008^2)