7+7=7×2或 2×74+4+4=4×3或 3×46+6+6+6=6×4或 4×65+5+5=5×3或 3×59+9+9+9+9+9=9×6或 6×9.故答案为:7,2,2,7,4,3,3,4,6,4,4,6,5,3,3,5,9,6,6,9.