Răspuns:
Spor
Explicație:
I. (21+9)×10=300
30x10=300
II. 21x10+9×10=300
210+90=300
300=300
I. 100x(52+288)=
100x 340= 34000
II. 100X52 +100x288=
5200+28800= 34000
I. (805-676)×1000= 129000
1 2 9x1000= 129000
II. 805×1000-676×1000=129000
805000-676000=129000
129000=129000