Răspuns:
5¹⁴·7⁸·13²=(5⁷)²·(7⁴)²·13² =(5⁷·7⁴·13)²este patrat perfect
3³⁵+3³⁴=3³⁴·(3¹+1)=3³⁴·4=(3¹⁷)²·2²=(3¹⁷·2)²este patrat perfect
2²⁵-7·2²⁰=2²⁰(2⁵-7)=2²⁰(32-7)=2²⁰·25=2²⁰·5²=(2¹⁰·5)² este patrat perfect
