...................................
1. (2+7) x 7 = 9 x 7 = 63
2.( 2 + 7) x 7 = 7 x 2 + 7 x 7 = 14 + 49 = 63
Răspuns:
(2+7)×7=9×7=63
sau
(2+7)×7=2×7+7×7=14+49=63