1 + 1 = 2

2 = 1 + 1

vậy 1 + 1 = 2

1 + 11 + 111 + 1111

= 12 + 1222

= 1234

cau tren minh sai nhe .

108.3.3=12

khó quá

15 + 25 x 10 

= 15 + 250

= 265

ơ ko phải 225 ak

456 nhe

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3x9 chia hết cho 3

=> 3 + 9 + x chia hết cho 3

=> 12 + x chia hết cho 3

=> x = 0 hoặc 3; 6; 9

mk còn lượt nè k mk r mk kb cho