Viết PTHH: a, NaOH (1) -> Na2SO4 (2) -> NaOH (3) -> Cu(OH)2 (4) -> CuO b, ZnSO4 (1) -> ZnCl2 (2) -> Zn(OH)2 (3) -> ZnO (4) -> Zn (NO3)2 c, Cu(OH)2 (1) -> CuSO4 (2) -> Na2SO4 (3) -> NaCl (4) -> NaNO3

một gen có 720.10³ đvC . Gen này có tỉ lệ ( A + T ) / ( G + X ) = 2 / 3

a ) tìm nu từng loại

b ) gen nhân đôi 1 số đợt , dùng 36000 nu tự do các loại . Tìm số đợt tự nhân đôi

GIÚP NHANHHHHH VS

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I think you should buy _____  pack of mineral water instead. And you can also buy _____  snacks such as potato crisps, 3 kilos of mandarins, 2 kilos of apples, 3 bunches of bananas, ______  cookies and soft candies.

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We should decorate our living room with _____ orange banner. We also need ________  ribbons, balloons, party hats and costume.

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I think that ______ cauliflower is not enough for 3 people. Let’s buy one more.