Kết quả tìm kiếm

I. Part 1: 1.A 2.C 3.B 4.C 5.B 6.D 7.B 8.A 9.D 10.A 11.C 12.C 13.D 14.A 15.B Part 2: 1.memorial 2.personal 3.information 4.historic 5.additional 6.culture 7.missing 8.marvelous 9.looking 10.energetic Part 3: 1.spent 2.realised 3.should have studied...

\frac{1+cosx+cos2x+cos3x}{2cos^{2}x+cosx-1} = \frac{(1+cos2x)+(cosx+cos3x)}{2cos^{2}x+cosx-1} = \frac{2cos^{2}x+2cosx.cos2x}{1+cos2x+cosx-1} = \frac{2cosx(cos2x+cosx)}{cos2x+cosx} = 2cosx pt <=> 2cosx = \frac{2}{3}(3-\sqrt{3}sinx) <=> cosx + \frac{\sqrt{3}}{3}sinx=1 Chia cả 2 vế cho...

. 4. n_(SO4 2-) = n_H2 = 0,5(mol) m_muối = m_KL + m_(SO4 2-) = 17,5 + 0,5.96 = 65,5(g)

1,Since the time this meeting is over, the board will have made several important. 2, We are reluctant to order more equipment from that firm because the last shipment was received so lately. 3, Before about 1980, most businesses have used carbon paper to make multiple copies of typed documents...

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