Question

URGENT
a= (12/5 + 3/2)(12/5 - 3/2)x5/13
b= (13/5 - 2/3)(13/5+2/3)x 5/21x81/29

Answer 1

Răspuns:

Explicație pas cu pas:

a.  (12/5+3/2)(12/5-3/2)x5/13=

   [ (12/5)²-(3/2)²]x5/13=

(144/25-9/4)x5/13=

(576-225)/100x5/13=27/20

b.  (13/5-2/3)(13/5+2/3)x5/21=

     (13/5)²-(2/3)²x(5x27)/(2x29)=

      (169/25-4/9)x135/203=

     (1521-100)/225x135/203=

      1421/225x135/203=

    (7x3)/5=21/5

Answer 2

Pozele conțin rezolvările.