Question

13+23+33+43+57=a². Tìm a

Answer 1

13+23+33+43+57=169

169=14^2

Answer 2

13 + 23 + 33 + 43 + 57 = a x a

169 = a x a

a = \(\sqrt{169}\)

a = 13

nhé !

Đ/s : 13

Answer 3

13+23+33+43+57=169

Mà: 13²=169

Và: (-13)²=169

=> a²=13² hoặc a²= (-13)²

=>a= 13 hoặc a= -13

Answer 4

13+23+33+43+57

=169

=13^2

Answer 5

\(13+23+33+43+57=a^2\)

\(\Rightarrow169=a^2\)

\(\Rightarrow\sqrt{169}=a\)

\(\Rightarrow a=13\)