根号12xy^2-根号3x^5+b^2-y根号3xy^2+5x根号48x^2y
=2y根号(3x)-x^2根号(3x)+b^2-y^2根号(3x)+20x^2根号(3y)
=(2y-x^2-y^2)根号(3x) +b^2 +20x^2根号(3y)
将x=3,y=2代入,得:
(2y-x^2-y^2)根号(3x) +b^2 +20x^2根号(3y)
=(4-9-4)*3+b^2+20*9*根号6
=180根号6-27+b^2
先化简,再求值:根号12xy^2-根号3x^5+b^2-y根号3xy^2+5x根号48x^2y,其中,x=3,y=2
先化简,再求值:根号12xy^2-根号3x^5+b^2-y根号3xy^2+5x根号48x^2y,其中,x=3,y=2
数学人气:496 ℃时间:2019-09-01 19:50:07
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