Răspuns:
Explicație pas cu pas:
25/12 + ( - 1 intreg si 2/9 ) - 7/4 = - 8/9
-> introduc intregul in fractie
1 intreg si 2/9 = ( 1×9+2)/9 = 11/9
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= 25/12 - 11/9 - 7/4 =
-> aduc fractiile la acelasi numitor, afland cel mai mic multiplu comun al numitorilor 12, 9 si 4 = 36
-> amplific fractia 25/12 cu 3 = ( 25×3)/(12×3) = 75/36
-> amplific fractia 11/9 cu 4 = ( 11×4)/(9×4) = 44/36
-> amplific fractia 7/4 cu 9 = ( 7×9)/(4×9) = 63/36
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= 75/36 - 44/36 - 63/36 =
= ( 31 - 63)/36 =
= - (32/36 )⁽⁴ =
= - (32:4)/(36:4) =
= - 8/9
