\(\dfrac{5}{27}-\dfrac{2}{-27}=\dfrac{5}{27}+\dfrac{2}{27}=\dfrac{7}{27}\)

\(\dfrac{7}{-25}+\dfrac{-8}{25}=\dfrac{\left(-7\right)+\left(-8\right)}{25}=\dfrac{-15}{25}=\dfrac{-3}{5}\)

\(\dfrac{23}{-11}-\dfrac{-3}{-11}=\dfrac{\left(-23\right)-3}{11}=\dfrac{-26}{11}\)

a) Số bút trong mỗi hộp là a và giả sử Mai đã mua x hộp được 28 bút.

Do đó 28 = a.x; nghĩa là a  \(\in\) Ư(28). Tương tự, Lan đã mua 36 bút nên a \(\in\) Ư(36). Hơn nữa a > 2.

b) Theo câu a) thì a là một ước chung của 28 và 36.

Ta có: 28 = 2² . 7 ; 36 = 2² . 3²

ƯCLN (28, 36) = 2² = 4. Do đó ƯC (28, 36) = Ư(4) = {1; 2; 4}.

Vì a là một ước chung và lớn hơn 2 nên a = 4.

c) Số hộp bút Mai đã mua là x và 4 . x = 28 nên x = 28 : 4 = 7.

Gọi số hộp bút Lan đã mua là y, ta có 4 . y = 36. Do đó y = 36 : 4 = 9.

Vậy Mai đã mua 7 hộp, Lan đã mua 9 hộp.

1/m_A+m_B=m_C+mD
2/A+B=C+D
  D=(A+B+C+D)-(A+B+C)
3/20,8_BACl2+14,2_Na2SO4=23,3_BaSO4+m_NaCl
    m_NaCl=( 20,8+14,2 ) - 23,3 = 11,7 gam

trời ơi ko đặt tính dc đừng bắt ngk đặt tính nxx

8695 dư 5 nhá bạn nhớ tick cho mình 

Cách biểu đạt tình cảm của nàh văn theo cách trực tiếp

Các bước làm văn bản :

Bước 1 : tìm hiểu đề-tìm ý-sắp xếp ý

Bước 2 : lập dàn ý-viết nháp

Bước 3: Viết bài

Bước 4 : đọc - sửa chữa

Reminds about Gac sky rice is a reminder of traditional Vietnamese food with red symbolizing luck and wealth. But the best thing is that Gac has many effects such as tonic eyes, anti-aging and lung, cardiovascular, neurological diseases ..

On the 1st or the Lunar New Year, every house also often has 1 big Gac fruit, bright orange red for special dish that is simple.

 Today is the 10th of the lunar calendar, the first day I officially make sky rice from A-Z. Also learn yourself some experience and also draw the general conclusion: Cooking is not difficult, just that you enjoy and spend some time, mind for it alone.

Ingredients: Half a pound of glutinous rice (the best kind of glutinous rice is still called the yellow flower sky rice, I don't understand why. Half of the fruit is ripe with red) Sugar, salt in the grain. Half a cup of white wine. A small stainless steel basket ( medium size rice cooker) (diameter should be around 18-20cm) / stainless steel jar. Steamer (I don't know what to call it, but rest assured, the rice cooker usually has this device, used for steaming buns. no, you can still flexibly use a small bowl instead! Electric rice cooker / chopsks / spoon

Method: Soak the rice for half a day - 1 day and then take out to drain, can be put in stainless steel or 1 large bowl. Gac scraped the inner part (temporarily called Gac's kernel) into a small bowl, poured the wine in and used a pickle spoon to melt the Gac meat, then poured it into the rice, taking the spoon to stir the red rice evenly. Sprinkle half a teaspoon of grain salt to make it sky. (no need to remove gac seed). Arrange the bowl / steamer down finally, pour 2 large bowls of water and put the basket / rice bowl on top. Plug in the rice cooker and set it to normal.

During the cooking process with the rice cooker (lasting about 1 hour - half hour) should regularly check the pot and occasionally turn on the Warm mode when the water boils (Because remember that sky rice cooked by steam). Also note 2-3 times to open the lid of the pot to stir the rice evenly!

When the sky rice has softened (try by drawing rice grains by hand), add about 2 tablespoons of sugar, stir with chopsks and cover, let Cook cook for about 10 minutes more and finish and set the plate. (Back sugar is because if you give sugar right from the beginning, the rice will take longer to cook).

When exposing to a plate to light the incense, squeeze tightly, and fast to show respect. My mother does not to give fat because she does not to eat greens, however, to make the shade more beautiful, you can add 1 tablespoon of cooking oil / 1 little chicken fat and stir well with sky rice and time for sugar.

Depending on the taste, you can add grated coconut / coconut milk stirring with sky rice to add fat and aroma, also in the same time as the sugar. There are people who are more picky, making more green beans or mung beans. The simple way: soak the green beans about 3 hours in advance and then use the steamed pot / basket. When pretty beans sprout, add sugar and grated coconut, stir and cook for about 5-10p. Remove steamed green beans, add 1 teaspoon of boiling water, use a spoon to make smooth. Should steamed beans first and then use the same tools to steam away Gac. By the time the flock of plates (preferably with a mold) can give the bottom layer of sky rice and then beans, then sky rice, then beans, then sky rice has a dish of Gac sky green beans that are both delicious and beautiful with 2 red colors - brilliant gold.

In many groups, I also see them sprinkle sesame / sesame sprinkled on it, which is also for aroma. Today the house still has vanilla, I also poured in the time to add sugar and mix well with sky rice, eating also fragrant, you can try. Choose the ripe Gac fruit, orange red, heavy hands, plus good luck certainly Gac fruit will give you the color of sky rice dish is beautiful without using any color!

This dish is loved by family and friends. It is a nutritious breakfast dish, a dish that is perfectly combined between the sweetness of Gac fruit, the fleshiness, the warmness of spices and the toughness of sky rice.

Ingredients: Half a pound of glutinous rice (the best kind of glutinous rice is still called the yellow flower sky rice, I don't understand why. Half of the fruit is ripe with red) Sugar, salt in the grain. Half a cup of white wine. A small stainless steel basket ( medium size rice cooker) (diameter should be around 18-20cm) / stainless steel jar. Steamer (I don't know what to call it, but rest assured, the rice cooker usually has this device, used for steaming buns. no, you can still flexibly use a small bowl instead! Electric rice cooker / chopsks / spoon

During the cooking process with the rice cooker (lasting about 1 hour - half hour) should regularly check the pot and occasionally turn on the Warm mode when the water boils (Because remember that sky rice cooked by steam). Also note 2-3 times to open the lid of the pot to stir the rice evenly!

Material 1) 1 kg of glutinous rice 2) 1 Gac fruit eaten 3) 3 teaspoons refined salt (or white sugar) 4) 2 tbsp of white wine making Step 1 Put rice in a clean bowl soak for 8 to 10 hours Step 2 Pick the rice and lemongrass with clean water, drain the rice, drain it, add 3 teaspoons of refined salt. Step 3 Gac tonic in half take all Gac fruit into a bowl for about 2 spoons of white wine or 2 spoons of fish sauce (the purpose of adding wine or fish sauce to Gac to fight up to wake up beauty), use plas gloves to put on Mixing and squeezing for Gac meat puree Step 4 Gac in mix with rice, remove Gac seeds Step 5 Pour water into a saucepan (add water to boil at the bottom without getting wet); Place the steamer into the lining of a towel with a clean thin cloth rubbing a little oil or grease, then put the Gac meat mixed rice into the map for 25 counts 30 minutes and open for about 3 to 4 teaspoons of chicken fat (can use dynamic fat Using the chopsks, stir well and cover the contents again for another 20 to 25 minutes. (If your family wants to eat Gac boiling sweet, greasy, add sugar and some coconut milk Depending on the sweetness, greasy of each family) Step 6 When the boil is cooked, turn off the heat to cool down, then take a bowl of boiling bowls into the bowl, use the spoon to gently stroke around and place it on the plate, so the boiling dish is complete.