Giá trị biểu thức: 8x^3+12x^2y+6xy^2+y^3 biết y=-2(x+1)
1. disasters/ are/ Natural/ destructive/.
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2. pollution/ causes/ dangerous/ Water/diseases/.
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3. should/ follow/ We/ the guidelines/.
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4. one of/ English- speaking/ is/ Australia/countries/the/.
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5. have/ How long/ learnt/ English/ you/?
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