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Aunt Deng bought 2kg tomatoes per kilogram a yuan and 1.5kg cucumbers per kilogram B yuan A-B means?
How much is a kilogram of tomato more expensive than a kilogram of cucumber
Aunt Li bought two kilograms of tomatoes, a yuan per kilogram, and 1.5 kilograms of cucumbers, B yuan per kilogram. What does 2A mean and 2A + 1.5b mean
It means that Aunt Li shared the money for two kilograms of tomatoes and 1.5 kilograms of cucumbers
Aunt Li spent 22.1 yuan to buy 5kg rice and 5kg flour. It is known that every kilogram of rice is 0.7 yuan cheaper than every kilogram of flour. How much is it per kilogram of rice?
Set X yuan per kilogram of rice
5*x +5*(x+0.7)=22.1
10x+3.5=22.1
10x=18.6
x=1.86
Aunt Li paid 105 yuan for 40 kg of rice and 15 kg of flour. Later, she returned 15 kg of flour and replaced it with 20 kg of rice, and paid another 3 yuan
15 kg flour is replaced by 20 kg rice, which shows that after the replacement, the total is 40 + 20 = 60 kg rice. Add 3 yuan to 105 yuan, that is 108 yuan. Divide 108 yuan by 60, that is 1.8 yuan, that is the price of a kilogram of rice. Subtract the original price of 40 kg rice from 105 yuan (40 times 1.8) 72 yuan, that is 33 yuan, that is 1
The odd numbers 1,3,5 starting from 1 Line up in a row and group, (1), (3,5), (7,9,11), (13,15,17,19), then which group is 2007, which number in this group?
We also need to solve the formula
Group 45, number 14
Fill in the blanks in ancient poetry reading
When we read, we should not only read in class books, but also read extra-curricular books, because "in this way, we can learn more new knowledge. We can't just read books with words, but also participate in social practice activities, Because "----------------------------."
What is love? It's Lin Sheng by the West Lake_______ ,________ The question is that Lu you was on his deathbed-__________ ,_____________ It's Du Fu's regret________ ,_________ What is friendship? It's when Li Bai and Wang Lun say goodbye__________ ,__________ Wang Wei sent two yuan envoys to Anxi___________ ,____________ His consolation was when Gao Shi was away from Dong Da_________ ,__________ The best wish is when Cen Shen sent judge Wu back to Beijing__________ ,__________ What is nostalgia?
When he Zhizhang returned home_________ ,_________ Wang Anshi sighed when he was sailing to Guazhou_________ ,__________ I think it's Li Bai in the quiet night_________ ,_________ The silent chant of
When we read, we should not only read in class books, but also read extra-curricular books, because "ask the canal that clear so, in order to have a source of fresh water", so that we can learn more new knowledge
As shown in the figure, m and N are the midpoint of AD and DC on both sides of the square ABCD, and cm and BN intersect at P
Don't be similar, don't have cosine theorem, don't have any knowledge other than the second course of Junior High School of people's education press
Details, the more detailed the solution, the better. Don't let me see symbols such as ∽, Tan, ㏒, ㏑, ∩, ∑, ∪, ∩
In RT △ BCN and RT △ CBM, BC = CD, {BCN =} CDM, CN = DM, so RT △ BCN ≌ RT △ CBM, so ∠ CBN =} DCM, so ∠ DCM + ∠ BNC = 90 °, CPN = 90 ° and a is RT △ BPE
The ratio of 2 / 15:2 / 3 and 18:0.6 was calculated
Hello: 2 / 15:2 / 3 = 2 / 15x3 / 2 = 1:5 = 1 / 5 18:0.6 = 180:6 = 30:1 = 30 if you don't understand this question, please click "adopt as satisfactory answer" in the lower right corner if you are satisfied. If you have any other questions, please send them to me and click my picture for help. The answer is not easy, please understand, thank you
√ 9-4 times root 5
√ X & # 178; + X & # 178; 1-2 (0
√ 9-4 times root 5
=√(4+5-2×2×√5)
=√(2-√5)²
=√5-2;
√ X & # 178; + X & # 178; 1-2 (0
In trapezoidal ABCD, if ad is parallel to BC, e is the midpoint of AB, and EF is parallel to BC, what is the relationship between DF and FC? Why?
DF=FC
prove:
Because e is the midpoint of AB and EF is parallel to BC
So EF is the median of trapezoid
So f is the midpoint of CD
That is DF = FC
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