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x=1,19
y=0,02
aflati:
X ori x+2xy+y ori y-(x+y)
si
x ori x-y ori y-(x-y)ori(x+y)


Răspuns :

x²+2xy+y²-(x+y)=(x+y)²-(x+y) =(x+y)(x+y-1)=(1,19+0,02)(1,19+0,02-1)=
=1,21×0,21=0,2541
si
x²-y²-(x-y)×(x+y)=x²-y²-(x²-y²)=x²-y²-x²+y²=2y²=2×0,02²=0,0008