Question

Tính nhanh :

a/ 34^2 + 66^2 + 68 . 66

b/ 74^2 + 24^2 - 48 . 74

giải zùm tớ nkan m.n

Answer 1

a/ 34^2 + 66^2 + 68 . 66

=34²+2.34.66+66²

=(34+66)²

=100²

=10000

b/ 74^2 + 24^2 - 48 . 74

=74²-2.74.24+24²

=(74-24)²

=50²

=2500

Answer 2

\(a,34^2+66^2+68.66\)

\(=34^2+2.34.66+66^2\)

\(=\left(34+66\right)^2\)

\(=100^2\)

\(=10000\)

\(b,74^2+24^2-48.74\)

\(=74^2-2.74.24+24^2\)

\(=\left(74-24\right)^2\)

\(=50^2\)

\(=2500\)