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Ajutor!!Dau coroană!!

AjutorDau Coroană class=

Răspuns :

a) (x+y)²=x²+2*x*y+y²
b) (x-3)²=x²-2*3x+3²
c) (7x-4y)²=7²*x²-2*7x*4y+4²*y²
d) (x-2)(x+2)=x²+2x-2x-2²
e) (3x-8y)(3x+8y)=3²x²+3x*8y-3x*8y-8²*y²
f) (x-√6y)²=x²-2*√6xy+6*y²
g) (3x+√2)²=3²*x²+2*3x*√2+2