February 2019 1 87 Report
Calculați:
(4/3)^6 × (1/8)^2 × (2/9)^9 × (3/4)^4 =
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In 200 g de sulfat de cupru 10% se introduce o bara de Mg , determinati masa de Cu depus.
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O substanta este alcatuita din trei elemente X , Y, T. Numarul atomic al elementului X este de doua ori mai mare decat numarul atomic al elementului Y. Diferenta dintre numerele atomice ale elementelor X si T este 3 . Elementul T formeaza ioni T- , izoelectronici cu 10Ne. Determinati numerele atomice ale elementelor
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De trecut propozitiile la vorbirea indirecta! Va rog! 1) Have you used a computer before? Yes I have 2) Did you inform your manager about your intention to leave ? 3) Hei ! Sarah said : Did you hear the car? What car ? asked Jhoe. The one that has driven us outside 5 ) Mrs. Simon said : Will you put some salts into the soup? 6) I ' ve been talking to the girl in the next bed yesterday we told each other all about our illness and our families.
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Calculati: ( x + 4 )( x - 3 ) - ( x - 1 )( x + 6) = Raspuns : -4x -6
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