Everybody help me with a math problem, hurry! Before two o clock 20

The mall is not profitable!

Reason: The cost of two tops: 135 ...75 = 180 Total cost: 180 108 = 288

This income is 135 2 = 270

All income is less than cost loss is 288 270 = 18 equation solution: let the original price of the top with a profit of 25% be x, x+, x=108, and the profit is 27 yuan;

The original price of the shirt with a loss of 25% is y,,y=180, and the loss is 45 yuan.

It should be noted that 25% of the profit loss is 25% of the original price.

You can also. Suppose a (profit) and b (loss) are the cost of two pieces of clothing a* b* a=108 b=180 2 pieces of clothing bought for 270 but the cost is 288 so the loss.

The original price of the first piece of clothing is x, (1+25%)x= 135, so x = 98, and the profit is 37 yuan.

The original price of the second piece of clothing is y, 1-25%)y=135, so y= 180, a loss of 45 yuan.

Therefore, in this transaction, the commodity is at a loss, and the loss is 8 yuan.

Let's say two pieces of clothing are sold for A and B, so:

1+, (so.)

a=108, b=180, the cost is 180 + 108 = 288> 135 + 135 = 270So it's a loss!

Sell for $270.

Cost: 135*(3|.)4+4|3) If it is greater than 270, it will be paid.

I wonder if the purchase price is the same?

Update 1:To count to 12% singing.

a) Computer CD 320 yuan 30% discount percentage --- 7% off selling price = 320x70% = = 224 yuan b) If the discount is 48% of the cost, find the profit percentage Discount = 320-224 = 96 yuan 96 yuan is 48% of the cost Cost = 96 48% = 96 = 200 yuan Profit = profit Because now there is a 7% discount.

To use 224 yuan as the selling price Profit = 224-200 = 24 yuan Profit percentage = (24 224) x 100% = answer The last step is to try to do it yourself with a computer. 2007-11-28 18:44:02 Supplement:

I know there's a problem b) If the discount is 48% of the cost, find the percentage of profit. "The discount is 48% of the cost"There is no cost. How to count @@

Reference: me

Asking price: 320x70 100 =224 (yuan) Profit percentage: 70 100x(1-48%) 70 100x52 =182 5 =

Selling price = 320x70% = = 224 yuan Discount = 320-224 = 96 yuan Cost = 96 48% = 96 = 200 yuan Profit = Profit Because now it is 7% off.

To use 224 yuan as the selling price, profit = 224-200 = 24 yuan.

Hello! Divide 21 to 8 o'clock into two periods, before and after 24 o'clock. Use 24 points minus 21 points to get 3 hours, 8 points is equivalent to 20 points, and use 20 points minus 12 points to get 8 hours.

The column formula is: 24-21 = 3 (hours), 20-12 = 8 (hours), 3 + 8 = 11 (hours).

When in doubt, please ask.

The fundamental difference between integers and fractions is to look at the denominator.

When the denominator contains letters whose values can be changed, it is a fraction.

In this problem, the denominator is x, and you can arbitrarily take a number that is not 0.

Hence the fractions.

However, if the value of the letter in the denominator is fixed, such as 1, it is still an integer because the denominator value cannot be changed.

This is a fraction. 4 (5x), (3x+1) (2x-1), (x 2+x+2) (x 3+9), etc. are also fractions.

Examples of integers: 2x 1, (5 8) x 2 6x 1, x 3, etc.

To determine whether a formula is a fraction, the following two conditions must be met:

1) The denominator of the fraction must contain an unknown number.

2) The value of the denominator cannot be zero, if the value of the denominator is zero, then the fraction is meaningless.

If x is an integer, 1 x is a fraction.

If x = 1 k(k z), then 1 x is an integer.

x is an integer, which is a fraction; x is the fraction, which needs to be simplified and determined.

If |x|>1 is a fraction.

If |x|<=1 may be a fraction or an integer.

Divisible is an integer Undivisible is a fraction.

1 x -1 (x≠0) is an integer, and all other times are fractions.

Fractions, of course.

According to the definition of fraction: the integer a divided by the integer b, which can be expressed in the form of a b. If there are letters in the division B, then it is called a fraction.

It's a fraction. (An algebraic formula with letters in the denominator is called a fraction).

Question 1 2x-(1+x) 3 3x+(7x-10) 3 pass points first, multiplied by 3,6x-(1+x) 9x+(7x-10).

6x-1-x＝9x+7x-10

5x-1＝16x-10

11x＝9x＝9/11

Question 2 9x-(

Divide and multiply at the same time, 2x 4x 2

400/ 5/6=480w

480-400=80w

It is planned to invest 480W and save 80W

6-6* 1 12=tons tons.

6-5 = 1 ton.

1 ton less.