Urgent !!!!
(-5)×(+7)×[-3/5]
[-7/9]×(-1)×5/7×(+3)


Răspuns :

( - 5 ) ×  ( + 7 ) × ( - 3 / 5 ) = - 35 × ( - 3 / 5 ) = 7 × 3 = 21

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( - 7 / 9 ) × ( - 1 ) × 5 / 7 × ( + 3 ) =

= + 7 / 9 × 5 / 7 × 3 =

= 7 / 7 ×  3 / 9 × 5 =

= 1 × 5 / 3 =

= 5 / 3 =

= 1 intreg si 2 / 3 = 1,(6)