Răspuns :
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
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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 ..
d)9a²+ 12ab + 4b² + 4a²-b²- 9a²+6ab- b²=6ab + 2b + 4a²
Pe f nu pot sa-l rezolv datorita puterilor ..