Mathematics Grade 8 Lower Stratification Lesson Practice Unit 2 P28 19 questions .

According to the title, the function of the sales volume and the unit price of the sales is listed.

y=x*[(4000-x) 100*10+100]When y=576000, solve the equation x=1800 (loss, round) or x=3200

So ** is 3200 yuan.

1) Solution: Let the average monthly growth rate be x

576000x(1-x) squared = 4000x1001-x) squared=

1 -x =+

x1=x2=

Because x is greater than 0, so x=

Answer: --4000*100+(squared*4000*100400000+336000+282240=1018240 (yuan).

1) Solution: Set the computer ** each drop x yuan, monthly sales increase x 100 * 10

4000—x）（100+x/100*10）=576000

400000+400x-100x-x²/10=576000

3000x-x²=1760000

x²-3000x+1760000=0

a=1, b=-3000, c=1760000 (time problem, didn't come up with cross multiplication).

b²-4ac=（-3000）²-4*1*1760000=9000000-7040000=1960000

x=(-b root number 4ac (symbol cannot be typed)) 2a=(3000 1400) 2

x1 = 800 x2 = 2200 (not in place, discard).

4000-800=3200 (yuan).

Then set the average monthly growth rate to y

4000（1+y）²=3200

1+y）²=

1+y= root number.

y= root number.

y1 y2 is not on topic, discard).

Answer: Monthly drop.

2) 4000-800 3200 (yuan) Answer: The sales of the computer in March ** is 3200 yuan.

Say it casually: In the future, the topic will be strong and you will always think of your own What you come up with is always your own Others will never be able to grab it Good luck.

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2. Isotope, angular ADC, angular ADF, CAD

8.Isotope angles: angle one and angle three, angle five and angle six.

Wrong angles: angle one and angle six, angle two and angle four.

Same side inner angles: angles 3 and 4, angles 3 and 5, angles 1 and 5, angles 2 and 6.

The circumference of the parallelogram ABCD is known to be 25 cm, and the distance between the opposite sides is DE = 2 cm and DF = 3 cm, respectively. Find the area of this parallelogram.

Mathematics Semester 2 Stratified Lessons with Laughing and Practicing Answers???

Please write down the title of that question in detail, no title, everyone has no idea, and everyone sells the law model to tease and solve the problem.

Multiplication of division.

I'm tired of it, hehe.

1+1=2, it's 2! You don't understand this? Sure enough, it was enough for 2