evalute (8/27)^-2/3-(1/3)^-2 -(7)^0
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Solution :
( 8/27 )^-2/3 - ( 1/3 )^-2 - 7^0
= ( 27/8 )^2/3 - 3² - 1
= ( 3³/2³ )^2/3 - 9 - 1
= ( 3/2 )^3×2/3 - 10
= ( 3/2 )² - 10
= 9/4 - 10
= ( 9 - 40 )/4
= -31/4
••••
( 8/27 )^-2/3 - ( 1/3 )^-2 - 7^0
= ( 27/8 )^2/3 - 3² - 1
= ( 3³/2³ )^2/3 - 9 - 1
= ( 3/2 )^3×2/3 - 10
= ( 3/2 )² - 10
= 9/4 - 10
= ( 9 - 40 )/4
= -31/4
••••
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