There is a batch of cement in the construction team. When 30% of this batch of cement is used, 160 bags are transported. At this time, the cement is 1 / 10 more than the original. How many bags of cement are there

There is a batch of cement in the construction team. When 30% of this batch of cement is used, 160 bags are transported. At this time, the cement is 1 / 10 more than the original. How many bags of cement are there

160 ÷ [(1-30%) + 1 / 10 + 1] = 400 (bags)
80 bottles of mineral water is five-thirds of pure water（
80 bottles of mineral water is half of pure water
Regarding purified water as unit one, the equivalent relation is: mineral water = purified water × 5 / 2
If the root sign a is greater than a, then the value range of a is
√a＞a
a＞a^2
a^2-a＜0
a(a-1)＜0
There are: a < 0, A-1 > 0 (1)
A: 0, a: 0 (2)
Because a is under the quadratic root, it is impossible to have the case of (1)
Therefore, there are: a > 0, a < 1
That is: the value range of a is: a ∈ (0,1)
0a^2
a^2-a
A batch of cement is stored in the construction site. When 30% of this batch of cement is used, another 160 bags are transported. At this time, there is 110 more than the original cement. How many bags of cement are stored?
(1 + 110) x - (1-30-1-30%) x = 160, (1 + 110) (1 + 110) x - (1-30-30% x = 160, (1 + 110) x - (1-30-30%) x = 160, (1 + 110) (1 + 110) x - (1-30-30% x = 160, (1 + 110) x - (1-30-30-30%) x = 160, from the meaning of the title, (1 + 110) x - (1 + 110) x - (1-30-30-30-30% x = 160, and from the theme, (1 + 110) x - (1-30-30-30-30-30-30-30-30-30-30-30) from, (1 + 110) x - (1 - (1 - (1-30-30-30-30-30-30-30-30-30-30-30) X-30) x = 160, (1 - (1-30) x = 160, from, (1 - (1-30) from, (1 - (1-30) from the, (1 - (1-30) from& nbsp; & nbsp; & nbsp; &X = 400. A: it used to store 400 bags of cement
Can pure water and mineral water make facial mask?
What seems to be what is said in pure water is that it doesn't contain anything. Making mask is actually not effective at all.
Some people say that pure water is better than mineral water?
Is that pure water and mineral water that you normally drink for a dollar?
Pure water can't, mineral water can
Pure water is weakly acidic, such as Wahaha. Mineral water is alkaline and rich in trace elements. It is very good for human body and skin. If you don't believe me, you can take your own pH test paper or go to the hospital for consultation
Mask is best for Evian, or farmer's mountain spring.
Downstairs that is advertising, Luffa water composition is uncertain, you can go to the relevant departments for testing
In △ ABC, if cosa = 1 / 3 and a = root 3, the maximum value of BC is
How did 9 / 4 of BC come from?
According to the mean inequality, BC is less than or equal to the square of two-thirds of B plus C brackets. If and only if B = C, it takes the equal sign, and then it has the maximum value. According to the sine theorem a / Sina = B / SINB, SINB is equal to the root of three-thirds, B is equal to three-thirds, so BC is equal to nine-quarters
You can understand by drawing
Ask a question (there is a batch of cement on the construction site. After 20% of the cement is used, another 6 tons are transported, and the result is 30% more than the original. How many tons of cement are there on the construction site?)
Process and trial
12 tons
The 6 tons transported here account for 50% of the original. If you divide 6 by 50%, you can easily understand the original as a unit
How can I explain and instruct the children? I give all my knowledge back to the teacher
A 34 + 16 = 50 and 70-50 = 20
B 65-50 = 15 and 7 + 15 = 22
A：70-（34+16）=20
B：7+（65-50）=22
Brackets represent a whole, and the inside of brackets represents the replaced number
Now the question, the more bullshit, the more difficult it is for our parents
Let {an} be an arithmetic sequence with tolerance D, A3 + A5 = 2, S20 = 150, and BN = 2An − 2An + 1 (n ∈ n *) (1) find A1, D; (2) prove that {BN} is an arithmetic sequence, and find the general formula of BN; (3) let K be a natural number and satisfy LiMn →∞ (bkbk + 1 + BK + 1bk + 2 +...) +Bnbn + 1) = 196, find the value of K
(1) From the general term formula and summation formula of the arithmetic sequence, we can get that a1 + 2D + A1 + 4D = 220a1 + 20 × 19d2 = 150  d = 1, A1 = - 2 (2) ∵ BN = 2an-2an + 1 = 21-n = (12) n-1 ∵ bnbn-1 = 12 ∵ sequence {BN} is an arithmetic sequence with 12 as the common ratio, BN = 12n-1 (3) ∵ bkbk + 1 = 12k-1 · 2K = 24K ∵ limn
A construction site uses 34 tons of cement in September, of which 89 tons are used in the second half of the month?
According to the meaning of the question: the output ratio of the first half of the month and the second half of the month is 9:8; then the consumption in the first half of the month is 34 (9 + 8) × 9, = 34 (17) × 9, = 18 (tons); in the second half of the month: 34-18 = 16 (tons); a: 18 tons are used in the first half of the month, and 16 tons are used in the second half of the month