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b) 4a²-1=4*a*a-1
c) t²-25k²=t*t-25*k*k
d) 1/4x²-0,01y²=1/4x*x-0,01y*y
e) 16a⁴-36b⁶=16*a*a*a*a*-36*b*b*b*b*b*b*
f) x⁶y⁸-x⁴y¹²=x*x*x*x*x*x*y*y*y*y*y*y*y*y*-x*x*x*x*y*y*y*y*y*y*y*y*y*y*y*y*