Question

6. efectuati : a) 6 supra 71 plus 69 supra 61 minus 18 supra 17 C) 51 supra 35 minus 13 supra 35 minus 12 supra 35. f) 5 supra 43 plus 23 supra 14 minus 18 supra 43. i) 16 supra 103 minus 5 supra 103 plus 7 supra 103

Answer 1

a) 6/71+ 69/61 -18/17 =(6*61*17+69*71*17-18*71*61)/71*61*17=
=(6222+83283-77958)/73627=
=11547/73627

c) 51/35-13/35-12/35=(51-13-12)/35=26/35

 f) 5/43+23/14-18/43=23/14-13/43=(23*43-13*14)/14*43=(989-182)/602= =807/602

i) 16/103-5/103+7/103 =(16-5+7)/103=18/103