a) 35 – 138 + 68 – 35
b) 123 – (-79) + 31 – (31+79)
c) -21 . 77 + 21 . 20 – 57 . 79
a) 35 – 138 + 68 – 35 b) 123 – (-79) + 31 – (31+79) c) -21 . 77 + 21 . 20 – 57 . 79
By Amaya
By Amaya
a) 35 – 138 + 68 – 35
b) 123 – (-79) + 31 – (31+79)
c) -21 . 77 + 21 . 20 – 57 . 79
a) 35 – 138 + 68 – 35
= (-103)+68-35
=(-35)-35
=-70
b) 123 – (-79) + 31 – (31+79)
=123 – (-79) + 31- 110
=202+31-110
=233-110
=123
c) -21 . 77 + 21 . 20 – 57 . 79
=(-1617)+420-4503
=(-1197)-4503
=-5700
a) 35-138+68-35
=(35-138)+(68-35)
=-103+33
=-70
b) 123-(-79)+31-(31+69)
=202+31-100
=233-100
=133
c) -21.77+21.20-57.70
=(-21.77)+(21.20)-(57.70)
=-1617+420-3990
=-1197-3990
=-5187