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huynhthienphueahleo
2 năm trước
cho a,b,c là ba số khác 0 thỏa mãn ab/a+b=bc/b+c=ca/c+a ( với giả thiết các tỉ số đều có nghĩa). Tính giá trị của biểu thức M=ab+bc+ca/a^2+b^2+c^2
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Fill each the numbered blanks in the following passage with ONE suitable word : Food plays an important part in the development of nations. In countries where food is (1)……........ people have to spend most of their time getting enough to eat . This usually slows down progress, because men have little time to (2)……............. to science, industry, government, and art . In nations where food is (3)................. and easy to get , men have more time to spend in activities that lead to progress and (4).............. of leisure . The problem of (5).............. good food for everybody has not yet been solved . Many wars have been (6) ............... for food . But it is no longer necessary to go to war for food . Nations are beginning to put (7)................. knowledge to work for a (8 )................ of their food problems . They work (9)............... in the Food and Agriculture Organization of the United Nations (FAO) to help hungry nations (10)................more food.

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