Andreeacristinaask
a fost răspuns

8.b) (2x+3y)²+(2x+3y)(2x-3y)
d)(3a+2b)²+(2a+b)(2a-b)-(3a-b)²
f) (2x²+y)²-(2x²-y)²+(x+y)(x-y)

Răspuns :

Soranaiulia7ask
b) (2x+3y)²+(2x+3y)(2x-3y)= =4x²+12xy+9y²+4x²-9y²=8x²+12xy d)(3a+2b)²+(2a+b)(2a-b)-(3a-b)²=9a²+12ab+4b²+4a²-b²-9a²-6ab+b²=4a²+4b²+6ab .
RebeccaAndreeaask
b) ( 2x + 3y ) ( 2x+3y+2x -3y )= (2x + 3y ) 4x = 8x² + 12xy
d)9a²+ 12ab + 4b² + 4a²-b²- 9a²+6ab- b²=6ab + 2b + 4a²
Pe f nu pot sa-l rezolv datorita puterilor ..

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