Question

43^2+42^2-86.42 tính nhanh

Answer 1

\(43^2-86\cdot42+42^2\)

\(=\left(43-42\right)^2\)

=1

Answer 2

\(43^2+42^2-86.42=\left(43-42\right)^2=1^2=1\)

Answer 3

giúp mk vs

 

Answer 4

=\(43^2+42^2-2.43.42=(43-42)^2=1^2=1\)

TIK MIK NHA