1supra17×(5supra28+1/42)×21/2

Răspuns :

1/17x(5/28+1/42)x21/2
= 1/17x (30+4/168)x21/2
= 1/17x 34/168x21/2
= 1x2/168x21/2
= 2/8x1/2= 2/16
= 1/8. #