Question

Wzory skróconego mnożenia.

Błagaaam xdd :

a2- a kwadrat jak cos itp

1( a2-b2)2 + (a2+b2)2 - ( pier z 2a2+ pierw z 2b2) (pierw z 2a2-pierw z 2b2)

2. -2/9 x2 + 2(1/3x-y) ( i/3x+y) - 5 [(x-y) * 2x- 3x ( x+ 1/6y)]

Answer 1

( a²-b²)² + (a²+b²)² - ( √2a²+ √2b²) ( √2a² - √2b²) =

= a⁴ - 2a²b² + b⁴ + a⁴ + 2a²b² + b⁴ - (2a⁴ - 2b⁴) =

=  a⁴ - 2a²b² + b⁴ + a⁴ + 2a²b² + b⁴ - 2a⁴ + 2b⁴ = 4b⁴

 

 

-2/9 x² + 2(1/3x-y) ( 1/3x+y) - 5 [(x-y) * 2x- 3x ( x+ 1/6y)] =

= -2/9x² + 2( 1/9x² -y²) – 5 [2x² -2xy – 3x² - 1/3xy] =

= -2/9x² + 2/9 x² - 2y² - 10x² + 10xy – 15x² + 5/3xy =

= -2y²  - 25x² + 11i2/3 xy