Calculați: A) (5 supra 6 +3 supra 4)×24 supra 19,B) (1 supra 6 +7 supra 9 ×18 supra 17,D) (5 supra 12 -3 supra 18×4,E) (11 supra 45-1 supra 30)×18 supra 19,Ajutor,Repede Dau Coroană!​

Răspuns :

Răspuns:

A) (5 supra 6 +3 supra 4)×24 supra 19

(5/6+3/4)×24/19

=(10/12+9/12)×24/19

=19/12×24/19

=19/19×24/12

=1×2

=2

B) (1 supra 6 +7 supra 9 ×18 supra 17,

1/6+7/9×18/17

=1/6+7/17×18/9

=1/6+7/17×2

=1/6+14/17

=17/102+84/102

=101/102

D) (5 supra 12 -3 supra 18×4

(5/12-3/18)×4

=(15/36-6/36)×4

=9/36×4

=1/4×4

=4/4

=1

E) (11 supra 45-1 supra 30)×18 supra 19

(11/45-1/30)×18/19

=(22/90-3/90)×18/19

=19/90×18/19

=18/90

=9/45

=1/5