Question

Tính nhanh: 

a) 34^2 + 66^2 + 68 . 66 

b) 74^2 + 24^2 – 48 . 74.

Answer 1

( 34^2+66^2+68.66

= 34^2 + 66^2 + 2. 34.66

= ( 34+66)^2

= 100^2 = 10 000

b) 74^2 + 24^2 - 48.74

= 74^2 + 24^2 - 2. 74 . 24

= (74-24)^2 = 50^2 = 2500 

Answer 2

a) 34^2 + 66^2 + 68 . 66 = 5580,66

b) 74^2 + 24^2 – 48 . 74 = 6003.26 

Answer 3

a, = 34^2 + 66^2 + 2.34.66

    = (34+66)^2 = 100^2 = 10000

b, = 74^2+24^2-2.24.74

   = (74-24)^2 = 500^2 = 250000

Tk mk nha

Answer 4

a) 34² + 66² + 68 . 66

= 34² + 2 . 34 . 66 + 66² 

= (34 + 66)² 

= 100² 

= 10000.

b) 74² + 24² – 48 . 74

= 74² - 2 . 74 . 24 + 24² 

= (74 - 24)² 

 =50² 

=2500

 

Answer 5

a)34^2+66^2+68.66

=34^2+66^2+2.34.66

 =(34+66)^2

=100^2

=10 000

b)74^2+ 24^2-48.74=

74^2+24^2-2.24.74

 =(74-24)^2

=50^2

=2500

Answer 6

a, \(34^2+66^2+68.66\)

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

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

\(=100^2=10000\)

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

\(=74^2+24^2-2.24.74\)

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

\(=50^2=2500\)