Que 1: ( 1/4)^-3 - 1/4^-3 / (1/5)=^-3 =1/5 ^-3 =5^3 =125 Que 2 :( 5^-1 × 3^-1)^-1 ÷6^-1. ={(1/5)×(1/3)}^-1 ÷1/6=(1/15^-1)÷1/6=15÷(1/6)=15×6 =90
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