化简求值(a- 1/2b)〖(a+1/2 b)^2-(a- 1/2b)^2〗*(a^2+ 1/2ab+b^2)-2b(a^4-1)a=2,b=-1
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解答:
(a- 1/2b)〖(a+1/2 b)^2-(a- 1/2b)^2〗*(a^2+ 1/2ab+b^2)-2b(a^4-1)
=(a-1/2b)[a^2+ab+1/(4b^2)-a^2+ab-1/(4b^2)]*(a^2+1/2ab+b^2)-2b(a^4-1)
=(a-1/2b)*2ab*(a^2+1/2ab+b^2)-2b(a^4-1)
=2a^4b+3a^2b^3/2-ab^4/4-2a^4b+2b
=3a^2b^3/2-ab^4/4+2b
=6-1/2+2=15/2
(a- 1/2b)〖(a+1/2 b)^2-(a- 1/2b)^2〗*(a^2+ 1/2ab+b^2)-2b(a^4-1)
=(a-1/2b)[a^2+ab+1/(4b^2)-a^2+ab-1/(4b^2)]*(a^2+1/2ab+b^2)-2b(a^4-1)
=(a-1/2b)*2ab*(a^2+1/2ab+b^2)-2b(a^4-1)
=2a^4b+3a^2b^3/2-ab^4/4-2a^4b+2b
=3a^2b^3/2-ab^4/4+2b
=6-1/2+2=15/2
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