342 + 68.66 + 662

= 342 + 2.34.66 + 662

= (34 + 66)2

= 1002

= 10000

34^2+662+4488

34²⁺⁵¹⁵⁰

34⁵¹⁵²

A. (34+66)²=100²=10000

B. (74-24)²=50²=2500

a)34^2+66^2+68.66 
=34^3+2.34.66+66^2 
=(34+66)^2 
=100^2=10000 

b)74^2+24^2-48.74 
=74^2-2.74.24+24^2 
=(74-24)^2 
=50^2=2500

a) \(34^2+66^2+68.66=34^2+2.34.66+66^2=\left(34+66\right)^2=10000\)

a) 34^2 + 66^2 + 68.66=34²+2.34.66+66²=(34+66)²=100²=10000

b) 74^2 + 24² - 48.74(câu b 24² mới đúng nhé)

=74²-2.24.74+24²

=(74-24)²=50²=2500

a) 34² + 66² + 68.66 = (34 + 66)² = 100² = 10000

b) phải là 24² mới đúng

74² + 24² - 48.74 = (74 - 24)² = 50² = 2500

a) \(34^2+66^2+68.66=\left(34+66\right)^2=10000\)

b) \(74^2+24^2-48.74=\left(74-24\right)^2=2500\)

\(\left(34+66\right)^2-2.34.66+68.66=100^2=10000\)

ý b tương tự nhé 

D = 34² + 2.34.66 + 66² = (34 + 66)² = 100² = 10000

^_^