Explicație pas cu pas:
Salutare!
(a)
(-5/8 + 7,6 ) - [10,8 - (8•4+3)/4]=
(-5/8 + 76/10) - (108/10 - 35/4) =
(-5•5/8 + 76•4/10) - (108•2/10 - 35•5/4) =
(-25/40 + 304/40) - (216/20- 175/20) =
279/40 - 41/20 =
(279 - 41•2)/40 =
(279 - 82)/40 =
197/40
(b)
(5 4/9 - 6 5/12) + (-3 2/3 - 5/9) =
[(5•9+4)/9 - (6•12+5)/12)] + [(-3•3+2)/3 - 5/9)] =
(41/9 - 77/12) + (-11/3 - 5/9) =
(41•4 - 3•77)/36 + (-11•3/9 - 5/9) =
(167 - 231)/36 + (-33 - 5)/9 =
-67/36 - 38/9 =
(-67 - 38•4)/36 =
(67 - 152)/36 =
-219/36 =
-73/12
==pav38==
