Răspuns:
a) (8z-t²)(8z+t²) = 64z²-t⁴
b) (√3a-b)(√3a+b) = 3a²-b²
c) (1/2a-5b²)(1/2a+5b²) = (1/2a)²-(5b²)² = 1/4a²-25b⁴
d) (0,3y+2x)(0,3y-2x) = 0,3²•y²-4x² =
= 9 pe 100 y²-4x² = 0,09y²-4x²
(9/100) = 9:100 = 0,09
EVERGREEN
