The original price of a product is 80 yuan, and now the price is increased by 20%. What's the current price? How to calculate the current price?

The original price of a product is 80 yuan, and now the price is increased by 20%. What's the current price? How to calculate the current price?

The current price is 1 + 20% of the original price = 120%
Current price = original price x 120%

The square of A-6A + 9 / the square of A-9

The square of A-6A + 9 / the square of A-9
=[(A-3) party] / [(a + 3) (A-3)]
=（a-3）/（a+3）

1. If a and B are real numbers, and there is always a / (X-5) + B / (x + 2) = (5x-4) / (X & # 178; - 3x-10), then a=____ ,B=____ [fill in the blanks,
2. Can the value of fraction (x + 3) / (X & # 178; - X-12) be equal to 0? Please explain the reason

If a and B are real numbers, and there is always a / (X-5) + B / (x + 2) = (5x-4) / (X & # 178; - 3x-10), then a=_ 7___ ,B=___ -2_ [fill in the blanks,
Can the value of fraction (x + 3) / (X & # 178; - X-12) be equal to 0? Please explain the reason
No, because if it = 0
So x + 3 = 0, x = - 3
In this case, the fraction X & # 178; - X-12 = 9 + 3-12 = 0 is meaningless

If a commodity is sold at 20% discount and the selling price is 14.80 yuan, how much is the original price

8 = 18.5 (yuan)
A: the original price is 18.5 yuan
May I help you!

-0.002x10 ^ 3 is expressed by scientific notation
Go back to the second floor. Isn't - 2 negative? Why can the number in front be negative?

-2X10^1

Given that a, B are opposite to each other, C, D are reciprocal to each other, the absolute value of X is 5, find: CD + A + B - | x | value!

cd=1,a+b=0,cd+a+b-|x|=-4

It is known that in square ABCD, e is the point on ad, BF bisects ∠ EBC intersects CD with F, and the proof is: be = AE + CF

Rotate △ Abe around point B to make AB and BC coincide,
Let △ BCG be the △ Abe after rotation
∴△ABE≌△CBG
∴AE = CG,BE = BG,∠ABE = ∠CBG
∵ BF is the angular bisector of ∠ EBC
∴∠EBF = ∠FBC
∴∠ABE+∠EBF =∠GBC + ∠FBC
∴∠ABF = ∠FBG
Square ABCD
∴AB//CD
∴∠ABF = ∠BFG
∴∠GBF = ∠BFG
∴BG = GF
∵GF = CG+CF = AE+ CF,BG = BE
∴BE = AE+CF

5 / 3-8 / 5 = 5 / 3 * 8 / 5; 9 / 2-11 / 9 = 9 / 2 * 11 / 9; 10 / 7-17 / 10 = 10 / 7-17 / 10
j

If we observe the law, we can see that in the subtraction of two formulas,
1. The two molecules have to be the same,
2. In the two denominators, the major denominator minor denominator = numerator
Let's set it up
A=m/a B=m/b b-a=m
There are
m/a-m/b
=(m×b-m×a)/(a×b)
=m(b-a)/(a×b)
=(m×m)/(a×b)
=(m/a)×(m/b)

Fill in the blanks of Science in grade one!
After the field measurement of the height around, and then the height of the point, with smooth connection, it becomes a contour
In the contour map, the contour is closed, and the terrain with lower altitude from outside to inside is ()
What terrain can develop into a river depends on the reason

Same curve Basin
Valleys can develop into rivers
The terrain of the valley is relatively low. The precipitation on the high mountains flows into the valley through surface runoff and underground runoff, and the runoff will form in the valley. The rocks in the valley are often hard. Under the impact of the water, the river will form gradually. If there is a small amount of runoff, the river will produce
In other words, the formation of valleys and rivers is a process of mutual promotion

As shown in the figure, in the isosceles trapezoid ABCD, AB / / DC, ad = BC = 8, ab = 10, CD = 6, find the area of the trapezoid ABCD

The main thing is to work out the height
From D, the vertical line is perpendicular to AB, and the perpendicular foot is e. in the triangle AED, ad = 8, AE = (10-6) / 2 = 2. Using Pythagorean theorem, it is calculated that de = 2 root sign 15, and De is the height of trapezoid. Using trapezoid area formula, it can be calculated that 16 root sign 15