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2 năm trước
tính a, -3 mũ 10 x 15 mũ 5 / 25 mũ 3 x -9 mũ 7 b, 2 mũ 3 x 1/9 mũ 0 - 2 mũ -2 x 4 + ( -2 mũ 2 : 1/2 ) x 8
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GIÚP EM VỚI. EM CẦN GẤP Ạ Everyone loves a sunny room. But do you know that a bright room can (1) ……………… you healthier, happier, (2) ……………… more hard-working? Amazing new research is teaching us (3) ……………… the effects of natural light. Daylight is important in schools. Canadian research suggests that students (4) ……………… better on tests in sunny, bright schools. Students are absent (5) ……………… often in these schools, too. Even more surprisingly, children (6) ……………… to grow taller in schools with lots of natural light. Sunlight is also good for business. The use of natural light instead of electric light makes customers (7) …………..…… more money in stores. One popular American store put in skylines (windows in the roof or ceiling) and, as a (8) …………..……, business is up 40 percent. In offices, workers who have windows near their desks work harder than those who don’t. They also miss fewer days of work. Sunlight is good for your health. In his book, Sunlight, Dr. Zane Kime advises readers to get plenty of it. (9) …………..…… to Kime, the sun’s light gives you more energy and causes your heart rate to go down. And with more windows, you use less electricity, which is good for Mother Earth. So open (10)……………… your curtains and let the sun shine in!

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