a) 27 la putere 5 : (-9) la putere 6
b) -32 la putere 5 : (-8) la putere 6 : (-2) la putere 2
C) 24 robinete umplu un bazin in 45 min. cate robinete umplu acelasi bazin in 1,2 h?
a. 27⁵/9⁶=[3³]⁵/9⁶=3¹⁵/[3²]⁶=3¹⁵/3¹²=3¹⁵⁻¹²=3³=27; b. -32⁵/8⁶/2²=[-2⁵]⁵/[2³]⁶/2²=-2²⁵/2¹⁸/2²=-2⁷/2²=-2⁵=-32; c. 24/y=45/72 ⇒y=24·45/72 ⇒y=45/3 ⇒y=15[robinete vor umple acelasi bazin];
