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+66)²=100²=10000

B. (74-24)²=50²=2500

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 

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

b) 74²+24²-48.74 = 24² - 2.24.74+74² = (24 - 74)² = (-50)² = 2500

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

b) \(=74^2+24^2-2.24.74=\left(74-24\right)^2=2500\)

c) \(=\left(729-728\right)\left(729+728\right)=1.1457=1457\)

d) \(=\left(1001-1\right)\left(1001+1\right)=1000.1002=1002000\)

Chúc bạn học tốt.

rút gn

a) (2-1)(2^2-1)(2^4+1)(2^8+1)