(3/4a^4b^7+1/2a^3b^8-1/9a^2b^6)/(-1/3ab^3)^2,其中a=1/2，b=-4
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(3/4a^4b^7+1/2a^3b^8-1/9a^2b^6)/(-1/3ab^3)^2
=(3/4a^4b^7+1/2a^3b^8-1/9a^2b^6)/(1/9a²b^6)
=27/4a²b＋9/2ab²-1
=27/4×1/4×【-4】＋9/2×1/2×16-1
=-27/4＋18-1
=-27/4＋17
=-27/4＋68/4
=41/4
=(3/4a^4b^7+1/2a^3b^8-1/9a^2b^6)/(1/9a²b^6)
=27/4a²b＋9/2ab²-1
=27/4×1/4×【-4】＋9/2×1/2×16-1
=-27/4＋18-1
=-27/4＋17
=-27/4＋68/4
=41/4
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