The price of a commodity increases by 10%, then decreases by 20%. The current price is () A. 80%B. 86%C. 88%D. 90%

The price of a commodity increases by 10%, then decreases by 20%. The current price is () A. 80%B. 86%C. 88%D. 90%

Suppose that the original price of the commodity is 100 yuan, then: 100 × (1 + 10%) × (1-20%) = 100 × 1.1 × 0.8 = 88 (yuan) 88 △ 100 = 88%, so choose: C

A number is divided twice by 2, once by 3 and 5, which is equal to 2 / 9. What is the original fraction

The original number was 30 out of 270

Grade one math problem. Thank you
If the profit of a company last year is x% higher than that of the previous year, then the profit of the previous year is ()
A.x B.100/x C.x/100+x D.100x/100+x

Choose C
Set profit a for the previous year
So last year's profit was (1 + 0.0x) a
0 XA less than last year
So the percentage is
0.0XA/[（1+0.0X）A]
=x/(100+x)

The price of a commodity is 14.8 yuan. How much is the price

Set a price of X Yuan
80%X=14.8
X=14.8/80%
X=18.5

1、（－0.5）2=______ ,｜－5｜+（-2）=_____ , 3 × (- 1 / 3) 3 =. 2=______ .3、

(1) The fifth power of 0.25 3 - 1 / 9 (2) 5.18 * 10

1. Column algebra expression:
(1) If the sum of two numbers is a, and one of them is 6 less than the other, what is the maximum number?
(2) If one side of a rectangle with a perimeter of 10x meters is 3x-2, what is the length of the other adjacent side?
2. The middle of three consecutive even numbers is 2n, and the first one is 2n____ The third is_____ The sum of the squares of these three numbers is____ (only formula)
3. Look at the following monomials: X, - 2x ^ 2,4x ^ 3, - 8x ^ 4,... According to the rule you find, the seventh is_____ The nth monomial is_____
4. The distance between a and B is a kilometer. A and B are walking from two places at the same time. The speed of a is m km / h, and that of B is n km / h. The distance between the two people is 0_________ .

1 (1) if the sum of two numbers is a, and one of them is 6 less than the other, then the largest number is (a + 6) / 2 (2) if one side of a rectangle with a perimeter of 10x meters is 3x-2, then the other adjacent side is 2x + 2m 2_ 2n-2_ The third is_ 2n+2_ These three

As shown in the figure, e and F are the points on the edge BC and CD of the square ABCD, be = CF, connecting AE and BF. Rotate △ Abe counterclockwise around the center of the square to △ BCF, and the rotation angle is α (& nbsp; 0 ° < α < 180 °), then ∠α=______ ．

∵ quadrilateral ABCD is a square. ∵ AOB = 90 °, so α = 90 °. So the answer is: 90 °

2/5 5/8 8/11 11/14 1 1/17=?
Wrong number. The original question should be: 2 / 5 + 5 / 8 + 8 / 11 + 11 / 14 + 14 / 17 =? Please use a simple algorithm,

It seems that this problem can't be solved by a simple algorithm. After my arduous calculation, I finally got the correct result: 176009 / 52360

How to fill in the blanks in the first volume of junior high school
1. When x = (), the formula 3 / 2-2x and 2 / 3-x are opposite to each other
2. When x = (), the values of the algebraic formula 3 + 3 / X and X-1 are equal
3. If the power of (A-1) x + 3 = - 6 is a linear equation of one variable with respect to x, then a = (), x = ()
Come on, just fill in the blanks,

I know the answer, because it doesn't show the one with no satisfactory answer, so that's it

Trapezoid ABCD, ab ‖ CD, angle d = 90 °, ab = 3, DC = 7, ad = 15, please find a point P on ad, so that PAB and PDC are the two triangles with vertex similar
There are three such p points, and the length of AP can be calculated respectively? (I know that the answer to AP is 4.5 or 15 ± root 141 / 2. I want to prove the process,

To make △ PAB ∽ DCP,
Then AP / CD = Pd / AB,