Cho 1+1 = 2

2+2 = 6

3+3 = 12

4+4 = 20

10+10 = ?

1 câu trả lời

1+1=2 [1.(1+1)=2]

2+2=6 [2.(2+1)=6]

3+3=12 [3.(3+1)=12]

4+4=20 [4.(4+1)=20]

Do đó:10+10=110 [10.(10+1)=110]