(2ab)^2(a^2+b^2)-(a^2b^2)÷a^3b^4+(-4a^4b^2)

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(2ab)^2(a^2+b^2)-(a^2b^2)÷a^3b^4+(-4a^4b^2)

(2ab)^2(a^2+b^2)-(a^2b^2)÷a^3b^4+(-4a^4b^2)
(2ab)^2(a^2+b^2)-(a^2b^2)÷a^3b^4+(-4a^4b^2)

(2ab)^2(a^2+b^2)-(a^2b^2)÷a^3b^4+(-4a^4b^2)
原式=4a^2b^2(a^2+b^2)-1/(ab^2)-4a^4b^2
=4a^4b^2+4a^2b^4-1/(ab^2)-4a^4b^2
=4a^2b^4-1/(ab^2)

x^2+y^2-4x+2y+F=0
(x-2)^2+(y+1)^2=-F+4+1
所以-F+4+1>0
F<5
所以区间是(-∞,5) x^2+y^2-4x+2y+F=0
(x-2)^2+(y+1)^2=-F+4+1
所以-F+4+1>0
F<5
所以区间是(-∞,5)