(x+y)^5÷(-x-y)^3(x-y)^2=?若4^a=80,4^b=5,求9^a÷3^2b

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(x+y)^5÷(-x-y)^3(x-y)^2=?若4^a=80,4^b=5,求9^a÷3^2b

(x+y)^5÷(-x-y)^3(x-y)^2=?若4^a=80,4^b=5,求9^a÷3^2b
(x+y)^5÷(-x-y)^3(x-y)^2=?若4^a=80,4^b=5,求9^a÷3^2b

(x+y)^5÷(-x-y)^3(x-y)^2=?若4^a=80,4^b=5,求9^a÷3^2b
(x+y)^5除以(-x-y)^3(x--y)^2=--(x+y)^2(x--y)^2
=--(x^2--y^2)^2
=--x^4+2x^2y^2--y^4.
因为 4^a=80, 4^b=5
所以 4^(a--b)=16=4^2
所以 a--b=2,
所以 9^a除以3^2b=9^a除以9^b
=9^(a--b)
=9^2
=81.

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