( + 3 / 8) + ( - 4 / 5) = [ + 3(5) + - 4(8)] / 8(5) = - 17 / 40( + 7.
4) - ( - 8.
7) = 28 - ( - 56) = 28 + 56 = 84( + 6.
32) - (0.
10) = 192 - 0 = 192( + 7 / 6) + ( - 8 / 4) = [ + 7(4) + 6( - 8)] / 6(4) = - 20 / 24 = - 5 / 6( - 3 / 9) - ( - 2 / 4) = [ - 3(4) - 9( - 2)] / 9(4) = 6 / 36 = 1 / 6( - 7.
48) - ( - 4.
3) = - 336 - ( - 12) = - 336 + 12 = - 324( - 8.
4) - ( - 3.
1) = - 32 - ( - 3) = - 32 + 3 = - 29( + 10.
3) + ( + 4.
2) = 30 + 8 = 38( - 6.
82) - ( + 4.
5) = - 492 - 20 = - 512( - 3 / 9) + ( - 4 / 3) = [ - 3(3) + 9( - 4)] / 9(3) = - 45 / 27 = - 5 / 3Suerte!