[tex]a)7 + ( - 9) - 5 = 7 - 9 - 5 = - 2 - 5 = - 7[/tex]
[tex]b) - 5 + ( - 6) \div ( - 6) = - 5 + 1 = - 4[/tex]
[tex]c)1 + 36 \div ( - 9 - 9) = 1 + 36 \div [ - 9 + ( - 9)] = 1 + 36 \div ( - 18) = 1 + ( - 2) = 1 - 2 = - 1[/tex]
[tex]d)1 + 6 \times (5 - 6) = 1 + 6 \times ( - 1) = 1 + ( - 6) = 1 - 6 = - 5[/tex]
[tex]e) - 6 - [3 - ( - 5) \div 5] = - 6 - [3 - ( - 1)] = - 6 - (3 + 1) = - 6 - 4 = ( - 6) + ( - 4) = - 10[/tex]
[tex]f)8 + [4 + ( - 7) \times ( - 9)] = 8 + (4 + 63) = 8 + 67 = 75[/tex]
