... th`o.ihˆo.itu.ho˘a.cdˆo`ng th`o.i phˆan k`y. (ii) Nˆe´u λ = 0 v`a t´ıch phˆan+∞ag(x)dx hˆo.itu.th`ı t´ıch phˆan+∞af(x)dx hˆo.itu..(iii) Nˆe´u λ =+∞ v`a t´ıch phˆan+∞af(x)dx ... t´ıch phˆan+∞af(x)dx hˆo.itu.. (ii) Nˆe´u t´ıch phˆan+∞af(x)dx phˆan k`y th`ı t´ıch phˆan+∞ag(x)dx phˆank`y.3) Dˆa´uhiˆe.u so s´anh II. Gia’su.’f(x) 0, g(x) > ... 0).(DS.18)15.Dxyzdxdydz; x =0,y =0,z =0,x2+ y2+ z2=1NGUYˆE˜N THUY’THANHB`AI TˆA.PTO´AN CAO CˆA´PTˆa.p3Ph´ep t´ınh t´ıch phˆan. L´y thuyˆe´t chuˆo˜i.Phu.o.ng tr`ınh vi...