已知a^2m=2,b^3n=3,求(a^3m)^2-(b^2n)^3的值
已知a^2m=2,b^3n=3,求(a^3m)^2-(b^2n)^3的值(-1)^5·[(-3)^2]^2...
已知a^2m=2,b^3n=3,求(a^3m)^2-(b^2n)^3的值
(-1)^5·[(-3)^2]^2 展开
(-1)^5·[(-3)^2]^2 展开
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a^2m=2 => (a^m)^2 = 2 => a^m = 2^(1/2)
b^3n=3 => (b^n)^3 =3 => b^n = 3^(1/3)
(a^3m)^2-(b^2n)^3
=(a^m)^6 - (b^n)^6
=(2^(1/2))^6 - (3^(1/3))^6
=2^3 - 3^2
=8-9
= -1
b^3n=3 => (b^n)^3 =3 => b^n = 3^(1/3)
(a^3m)^2-(b^2n)^3
=(a^m)^6 - (b^n)^6
=(2^(1/2))^6 - (3^(1/3))^6
=2^3 - 3^2
=8-9
= -1
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(a^3m)^2-(b^2n)^3=a^6m-b^6m=(a^2m)^3-(b^3n)^2=2^3-3^2=8-9=-1
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